{"id":22825,"date":"2026-09-18T12:53:05","date_gmt":"2026-09-18T12:53:05","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=22825"},"modified":"2026-11-11T10:25:18","modified_gmt":"2026-11-11T10:25:18","slug":"export-online-archive-to-pst","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/","title":{"rendered":"Export Online Archive to PST: Export 100GB+ Mailbox Data Securely"},"content":{"rendered":"<div class=\"p-4 mb-4\" style=\"border: 2px solid #005EFF; border-radius: 30px;\">\n<p><strong>User Query: <\/strong>I\u2019m trying to export a user\u2019s <em>370 GB Online Archive to PST<\/em>, with the data separated by year. The export has been running for a few days, but the Online Archive is still showing around 370 GB. Does anyone know another method to perform this process without any difficulties?<\/p>\n<\/div>\n<div class=\"block_sum\">\n<p><strong>Introduction: <\/strong>Microsoft 365 Online Archive stores old emails separately from the primary mailbox. However, exporting a large archive can take considerable time, especially when the data needs to be saved year by year. For example, a 370 GB Online Archive\u00a0may take several days to export Online Archive to PST. In this blog, we will discuss the manual method and a professional <a href=\"https:\/\/www.sysinfotools.com\/office-365-export-to-pst.php\" target=\"_blank\" rel=\"noopener\"><strong>SysInfo Microsoft 365 to PST Export Tool<\/strong><\/a> for handling large archive data more easily.<\/p>\n<div class=\"blog-btn\">\n    <ul id=\"db-btn-container\" class=\"nav nav-tabs mt-4\" role=\"tablist\">\n        <li class=\"nav-item\">\n            <a id=\"windows-tab\" class=\"nav-link active\" role=\"tab\" href=\"#windows\" data-toggle=\"tab\" aria-controls=\"windows\" aria-selected=\"true\">\n                <i class=\"icon-windows\"><\/i> Windows\n            <\/a>\n        <\/li>\n        <li class=\"nav-item\">\n            <a id=\"mac-tab\" class=\"nav-link\" role=\"tab\" href=\"#mac\" data-toggle=\"tab\" aria-controls=\"mac\" aria-selected=\"false\">\n                <i class=\"icon-apple\"><\/i> Mac\n            <\/a>\n        <\/li>\n    <\/ul>\n    <div id=\"db-btn-containerContent\" class=\"tab-content my-2\">\n        <div id=\"windows\" class=\"tab-pane fade active show\" role=\"tabpanel\" aria-labelledby=\"windows-tab\">\n            <a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/office-365-export-to-pst.php\" target=\"_blank\">\n                <i class=\"icon-windows\"><\/i> Download Now\n            <\/a>\n        <\/div>\n        <div id=\"mac\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"mac-tab\">\n            <a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/office-365-export-to-pst.php\" target=\"_blank\">\n                <i class=\"icon-apple\"><\/i> Download Now\n            <\/a>\n      <\/div>\n    <\/div>\n<\/div>\n<\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<div class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/div>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#Why_Export_Exchange_Online_Archive_Mailbox\" >Why Export Exchange Online Archive Mailbox?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#Method_1_Export_Online_Archive_to_PST_Using_Outlook\" >Method 1: Export Online Archive to PST Using Outlook<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#Method_2_Export_Online_Archive_Mailbox_to_PST_Using_eDiscovery\" >Method 2: Export Online Archive Mailbox to PST Using eDiscovery<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#Method_3_Professional_Tool_to_Export_Online_Archive_to_PST\" >Method 3: Professional Tool to Export Online Archive to PST<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#Simple_Steps_to_Export_Office_365_Archive_Mailbox_to_PST\" >Simple Steps to Export Office 365 Archive Mailbox to PST<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#How_to_Verify_After_Export_Exchange_Archive_Mailbox_to_PST\" >How to Verify? After Export Exchange Archive Mailbox to PST<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#Conclusion\" >Conclusion<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Why_Export_Exchange_Online_Archive_Mailbox\"><\/span>Why Export Exchange Online Archive Mailbox?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li aria-level=\"1\"><strong>Local backup:<\/strong> Keep another copy of important archived emails.<\/li>\n<li aria-level=\"1\"><strong>Migration<\/strong>: Move archived mailbox data to another environment.<\/li>\n<li aria-level=\"1\"><strong>Legal requirements: <\/strong>Preserve mailbox information for investigation or review.<\/li>\n<li aria-level=\"1\"><strong>Offline access: <\/strong>Open archived emails without connecting to Microsoft 365.<\/li>\n<li aria-level=\"1\"><strong>Long-term storage:<\/strong> Store older emails on local or external storage.<\/li>\n<\/ul>\n<table border=\"2\">\n<tbody>\n<tr>\n<td>\n<p><strong>Note<\/strong>: Exchange Web Services (EWS) has been used to access Exchange Online mailbox data, including emails, calendars, and contacts. However, Microsoft is moving toward newer APIs as part of its <a href=\"https:\/\/www.sysinfotools.com\/blog\/ews-retirement\/\" target=\"_blank\" rel=\"noopener\"><strong>EWS retirement<\/strong><\/a>. Before using an EWS-based method for mailbox export, check the current Microsoft 365 requirements.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_1_Export_Online_Archive_to_PST_Using_Outlook\"><\/span>Method 1: Export Online Archive to PST Using Outlook<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If the Online Archive mailbox is visible in the Outlook desktop application. You can use Outlook&#8217;s Import\/Export feature to export it.<\/p>\n<ol>\n<li aria-level=\"1\">Launch the <strong>Outlook desktop application<\/strong> connected to the Microsoft 365 account containing the Online Archive.<\/li>\n<li aria-level=\"1\">Look for a folder such as:<strong> In-Place Archive<\/strong> &#8211; [Mailbox Name] or a similar archive mailbox name.<\/li>\n<li aria-level=\"1\">Expand the archive and check whether the required folders and emails are available.<\/li>\n<li aria-level=\"1\">Go to: <strong>File <\/strong>\u2192 Open &amp; Export \u2192 Import\/Export. The exact menu names can vary depending on the Outlook version.<\/li>\n<li aria-level=\"1\">Choose: Export to a file and click Next. Click: Outlook Data File (.pst) and continue.<\/li>\n<li aria-level=\"1\">Select the Online Archive mailbox or the required archive folder.<\/li>\n<li aria-level=\"1\">If you want to include subfolders, enable the option to include subfolders.<\/li>\n<li aria-level=\"1\">Select where you want to save the PST file.<\/li>\n<li aria-level=\"1\">Choose a location with enough free storage because a large Online Archive can create a very large PST file.<\/li>\n<li aria-level=\"1\">Click Finish to begin the export. Outlook will create the PST file containing the selected archive data.<\/li>\n<\/ol>\n<h4 class=\"main_heading\">Limitations of Manual Online Archive Export to PST<\/h4>\n<ul>\n<li aria-level=\"1\">Large exports can take considerable time.<\/li>\n<li aria-level=\"1\">Outlook must remain available during the process.<\/li>\n<li aria-level=\"1\">Large PST files can become difficult to manage.<\/li>\n<li aria-level=\"1\">Exporting multiple archive mailboxes manually takes time.<\/li>\n<li aria-level=\"1\">The process depends on the archive being accessible through Outlook.<\/li>\n<li aria-level=\"1\">Export failures can require starting or repeating the export.<\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_2_Export_Online_Archive_Mailbox_to_PST_Using_eDiscovery\"><\/span>Method 2: Export Online Archive Mailbox to PST Using eDiscovery<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Microsoft 365 administrators can also use Microsoft&#8217;s compliance and <a href=\"https:\/\/www.sysinfotools.com\/blog\/ediscovery-for-law-firms\/\" target=\"_blank\" rel=\"noopener\"><strong>eDiscovery for Law Firms<\/strong><\/a>.<\/p>\n<ol>\n<li aria-level=\"1\">Sign in to the <strong>Microsoft Purview portal <\/strong>using an account with the required permissions.<\/li>\n<li aria-level=\"1\">Create or open an appropriate eDiscovery case.<\/li>\n<li aria-level=\"1\">Configure the search for the required mailbox.<\/li>\n<li aria-level=\"1\">Specify the mailbox or users whose data needs to be collected.<\/li>\n<li aria-level=\"1\">Configure the search according to the available Microsoft 365 options and ensure the required mailbox data is included.<\/li>\n<li aria-level=\"1\">Review the collected data before exporting it.<\/li>\n<li aria-level=\"1\">This step is important when the export is being performed for legal or compliance purposes.<\/li>\n<li aria-level=\"1\">Use the available export option to download the collected mailbox data.<\/li>\n<\/ol>\n<p><strong>Limitations: <\/strong>The Microsoft 365 compliance route can involve:<\/p>\n<ul>\n<li aria-level=\"1\">Additional permissions<\/li>\n<li aria-level=\"1\">Compliance role configuration<\/li>\n<li aria-level=\"1\">Search and collection setup<\/li>\n<li aria-level=\"1\">Export configuration<\/li>\n<li aria-level=\"1\">Large data processing<\/li>\n<li aria-level=\"1\">Administrative knowledge<\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_3_Professional_Tool_to_Export_Online_Archive_to_PST\"><\/span>Method 3: Professional Tool to Export Online Archive to PST<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To overcome all the limitations, use the reliable <strong>SysInfo Exchange Server to PST Export Tool.<\/strong> It works with Exchange Online, on-premises Exchange, and hybrid Exchange deployments. Exports Primary, Archive, Shared, and Public mailboxes without requiring Outlook. Offers several advanced features, such as Remove Duplicates, Date Filter, Free up server space, skip previously migrated items, split large PST files, and more.\u00a0<\/p>\n<p>This utility runs on localhost to avoid synchronization errors and <a href=\"https:\/\/www.sysinfotools.com\/blog\/backup-office-365-mailbox-to-pst\/\" target=\"_blank\" rel=\"noopener\"><strong>exports Office 365 Mailbox to PST<\/strong><\/a> over 100 GB+. Suitable for both technical and non-technical users. Also, you can download this tool on both Windows and Mac systems. Multiple licensing options, including a demo version (Used to test its features and functions).\u00a0<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Simple_Steps_to_Export_Office_365_Archive_Mailbox_to_PST\"><\/span>Simple Steps to Export Office 365 Archive Mailbox to PST<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li aria-level=\"1\">Download the software, click on <strong>Open Browser (Localhost)<\/strong>.<\/li>\n<li aria-level=\"1\">Sign in using <strong>Single User OAuth<\/strong> or<strong> Client ID &amp; Secret ID<\/strong>.<\/li>\n<li aria-level=\"1\">Choose <strong>Online Archive Mailbox Type<\/strong> to export. Use <strong>Mapping<\/strong>.<\/li>\n<li aria-level=\"1\">Select the <strong>mailbox folder <\/strong>and choose <strong>PST <\/strong>as the Saving Format.<\/li>\n<li aria-level=\"1\">Apply <strong>advanced features<\/strong> and <strong>filters <\/strong>as needed. Press <strong>Start Export.<\/strong><\/li>\n<\/ol>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_Verify_After_Export_Exchange_Archive_Mailbox_to_PST\"><\/span>How to Verify? After Export Exchange Archive Mailbox to PST<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Creating a PST does not automatically mean that the export was successful. After exporting the Online Archive, open the PST in Outlook and check:<\/p>\n<ul>\n<li aria-level=\"1\">Number of folders<\/li>\n<li aria-level=\"1\">Number of emails<\/li>\n<li aria-level=\"1\">Important dates<\/li>\n<li aria-level=\"1\">Attachments<\/li>\n<li aria-level=\"1\">Sent and received messages<\/li>\n<li aria-level=\"1\">Custom folders<\/li>\n<li aria-level=\"1\">Older archived messages<\/li>\n<li aria-level=\"1\">You can also open several messages from different dates to confirm that the content and attachments are readable.<\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This blog explained the manual methods and a professional tool to export Online Archive to PST. For a single mailbox, Outlook may be enough when the archive is accessible through the desktop application. There are other Microsoft 365 compliance tools that one may use when exporting is concerned with compliance or eDiscovery. Where there are large Online Archives or many mailboxes, one may opt for software that will facilitate the process through features like filtering, batching, splitting, incrementing exports, and reports.<\/p>\n<h3 class=\"faq_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1789734753622\"><strong class=\"schema-faq-question\">Q1. Can I export Exchange Archive Mailbox to PST?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>You can use Outlook when the archive is available in the Outlook desktop app. For large archives or multiple mailboxes, a dedicated Exchange Server to PST Tool can make the process easier.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734780199\"><strong class=\"schema-faq-question\">Q2. What data can be exported from an Online Archive mailbox?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>You can export supported mailbox data such as emails, attachments, folders, and other available mailbox items.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734780780\"><strong class=\"schema-faq-question\">Q3. Can attachments be included when exporting Online Archive to PST?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>Yes. Email attachments can be included when you export Online Archive data to PST. After exporting the data, you can start opening some emails from the PST and viewing their attachments for validation.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734781581\"><strong class=\"schema-faq-question\">Q4. Is administrator permission required to export an Office 365 archive mailbox?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>The tool offers two Office 365 authentication methods: Modern Authentication or Client Secret ID. So, admin permission depends on the method.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734782668\"><strong class=\"schema-faq-question\">Q5. How can duplicate emails be avoided during archive export?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>Use the Remove Duplicate feature of the professional tool. It allows users to delete duplicate emails based on To, From, Subject, Body, or CC.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734783317\"><strong class=\"schema-faq-question\">Q6. Is it safe to export confidential Online Archive data to PST?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>Yes, but the PST file should be handled carefully because it can contain sensitive emails and attachments. Save it in a secure location, restrict access to authorized users, and avoid storing it on unsecured devices or shared locations.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734783925\"><strong class=\"schema-faq-question\">Q7. What is the best way to export Online Archive to PST?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>The SysInfo Office 365 Export to PST is the professional tool to export Online Archive into PST format without any data loss. It preserves the original email formatting, structure, and metadata during the entire process.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734784477\"><strong class=\"schema-faq-question\">Q8. What can I do if some Online Archive emails are missing from the PST?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>First, check whether the missing emails were present in the selected archive folders and whether any date or item filters were applied. Also, compare the exported PST with the original Online Archive. If the problem continues, try exporting the required folders again using another supported export method.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1789734785798\"><strong class=\"schema-faq-question\">Q9. Does date range filtering reduce the size of the exported PST?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>The professional tool offers a Date Filter for selective email migration based on Start or End Date. It helps to reduce the size of exported PST files.<\/p> <\/div> <\/div>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;22825&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Export Online Archive to PST: Export 100GB+ Mailbox Data Securely&quot;,&quot;width&quot;:&quot;142.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 142.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            5\/5 - (1 vote)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>User Query: I\u2019m trying to export a user\u2019s 370 GB Online Archive to PST, with the data separated by year.<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":22828,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1594],"tags":[],"class_list":["post-22825","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-backup"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Export Online Archive to PST: Export 100GB+ Mailbox Data<\/title>\n<meta name=\"description\" content=\"Export Exchange Archive Mailbox to PST securely. Discover methods to export large archives, preserve folders and emails, and avoid data loss.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Export Online Archive to PST: Export 100GB+ Mailbox Data\" \/>\n<meta property=\"og:description\" content=\"Export Exchange Archive Mailbox to PST securely. Discover methods to export large archives, preserve folders and emails, and avoid data loss.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/\" \/>\n<meta property=\"og:site_name\" content=\"SysinfoTools Tech Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/sysinfotools\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-18T12:53:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-11-11T10:25:18+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.sysinfotools.com\/blog\/wp-content\/uploads\/2026\/09\/online-archive-to-pst.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"698\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Simran Bhatia\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Simran Bhatia\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/\"},\"author\":{\"name\":\"Simran Bhatia\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/#\\\/schema\\\/person\\\/0bc86a610ba204e43dcf67ac0c4f422a\"},\"headline\":\"Export Online Archive to PST: Export 100GB+ Mailbox Data Securely\",\"datePublished\":\"2026-09-18T12:53:05+00:00\",\"dateModified\":\"2026-11-11T10:25:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/\"},\"wordCount\":1316,\"publisher\":{\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/online-archive-to-pst.webp\",\"articleSection\":[\"Cloud Backup\"],\"inLanguage\":\"en-US\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/\",\"url\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/\",\"name\":\"Export Online Archive to PST: Export 100GB+ Mailbox Data\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/online-archive-to-pst.webp\",\"datePublished\":\"2026-09-18T12:53:05+00:00\",\"dateModified\":\"2026-11-11T10:25:18+00:00\",\"description\":\"Export Exchange Archive Mailbox to PST securely. 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Can I export Exchange Archive Mailbox to PST?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\\\/strong>You can use Outlook when the archive is available in the Outlook desktop app. For large archives or multiple mailboxes, a dedicated Exchange Server to PST Tool can make the process easier.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734780199\",\"position\":2,\"url\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734780199\",\"name\":\"Q2. What data can be exported from an Online Archive mailbox?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\\\/strong>You can export supported mailbox data such as emails, attachments, folders, and other available mailbox items.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734780780\",\"position\":3,\"url\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734780780\",\"name\":\"Q3. Can attachments be included when exporting Online Archive to PST?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\\\/strong>Yes. Email attachments can be included when you export Online Archive data to PST. After exporting the data, you can start opening some emails from the PST and viewing their attachments for validation.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734781581\",\"position\":4,\"url\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734781581\",\"name\":\"Q4. Is administrator permission required to export an Office 365 archive mailbox?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\\\/strong>The tool offers two Office 365 authentication methods: Modern Authentication or Client Secret ID. So, admin permission depends on the method.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734782668\",\"position\":5,\"url\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734782668\",\"name\":\"Q5. How can duplicate emails be avoided during archive export?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\\\/strong>Use the Remove Duplicate feature of the professional tool. It allows users to delete duplicate emails based on To, From, Subject, Body, or CC.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734783317\",\"position\":6,\"url\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734783317\",\"name\":\"Q6. Is it safe to export confidential Online Archive data to PST?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\\\/strong>Yes, but the PST file should be handled carefully because it can contain sensitive emails and attachments. Save it in a secure location, restrict access to authorized users, and avoid storing it on unsecured devices or shared locations.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734783925\",\"position\":7,\"url\":\"https:\\\/\\\/www.sysinfotools.com\\\/blog\\\/export-online-archive-to-pst\\\/#faq-question-1789734783925\",\"name\":\"Q7. What is the best way to export Online Archive to PST?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans. <\\\/strong>The SysInfo Office 365 Export to PST is the professional tool to export Online Archive into PST format without any data loss. 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Can I export Exchange Archive Mailbox to PST?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>You can use Outlook when the archive is available in the Outlook desktop app. For large archives or multiple mailboxes, a dedicated Exchange Server to PST Tool can make the process easier.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734780199","position":2,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734780199","name":"Q2. What data can be exported from an Online Archive mailbox?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>You can export supported mailbox data such as emails, attachments, folders, and other available mailbox items.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734780780","position":3,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734780780","name":"Q3. Can attachments be included when exporting Online Archive to PST?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>Yes. Email attachments can be included when you export Online Archive data to PST. After exporting the data, you can start opening some emails from the PST and viewing their attachments for validation.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734781581","position":4,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734781581","name":"Q4. Is administrator permission required to export an Office 365 archive mailbox?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>The tool offers two Office 365 authentication methods: Modern Authentication or Client Secret ID. So, admin permission depends on the method.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734782668","position":5,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734782668","name":"Q5. How can duplicate emails be avoided during archive export?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>Use the Remove Duplicate feature of the professional tool. It allows users to delete duplicate emails based on To, From, Subject, Body, or CC.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734783317","position":6,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734783317","name":"Q6. Is it safe to export confidential Online Archive data to PST?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>Yes, but the PST file should be handled carefully because it can contain sensitive emails and attachments. Save it in a secure location, restrict access to authorized users, and avoid storing it on unsecured devices or shared locations.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734783925","position":7,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734783925","name":"Q7. What is the best way to export Online Archive to PST?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>The SysInfo Office 365 Export to PST is the professional tool to export Online Archive into PST format without any data loss. It preserves the original email formatting, structure, and metadata during the entire process.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734784477","position":8,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734784477","name":"Q8. What can I do if some Online Archive emails are missing from the PST?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>First, check whether the missing emails were present in the selected archive folders and whether any date or item filters were applied. Also, compare the exported PST with the original Online Archive. If the problem continues, try exporting the required folders again using another supported export method.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734785798","position":9,"url":"https:\/\/www.sysinfotools.com\/blog\/export-online-archive-to-pst\/#faq-question-1789734785798","name":"Q9. Does date range filtering reduce the size of the exported PST?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>The professional tool offers a Date Filter for selective email migration based on Start or End Date. 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