{"id":20,"date":"2010-07-01T08:47:05","date_gmt":"2010-07-01T08:47:05","guid":{"rendered":"http:\/\/sysinfotools.com\/blog\/?p=20"},"modified":"2026-02-26T07:32:35","modified_gmt":"2026-02-26T07:32:35","slug":"how-to-compress-pst-file","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/","title":{"rendered":"Simple Ways to Compress PST Files &amp; Fix Slow Outlook Issues"},"content":{"rendered":"<div class=\"block_sum\">\n<p>The biggest productivity killer in Outlook is an oversized PST file, which doesn\u2019t allow users to easily access their data as before. With time, emails, contacts, calendars, and more data outgrows within a Personal Storage Table more than it can contain. This often results in freezing Outlook, crashes, corruption, and other occasional issues. Hence, it is important to compress PST files to ensure a reliable and speedy Outlook performance without halts. This guide explains some basic manual fixes and <strong>SysInfo<\/strong> <a href=\"https:\/\/www.sysinfotools.com\/recovery\/pst-compress.php\"><strong>PST Compress and Compact Tool<\/strong><\/a> for quick handling.<\/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\"><a id=\"windows-tab\" class=\"nav-link active\" role=\"tab\" href=\"#windows\" data-toggle=\"tab\" aria-controls=\"windows\" aria-selected=\"true\"><i class=\"icon-windows\"><\/i> Windows<\/a><\/li>\n<li class=\"nav-item\"><a id=\"mac-tab\" class=\"nav-link\" role=\"tab\" href=\"#mac\" data-toggle=\"tab\" aria-controls=\"mac\" aria-selected=\"false\"><i class=\"icon-apple\"><\/i> Mac<\/a><\/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\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-PST-Compress-Compact.exe\"><i class=\"icon-windows\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/pst-compress.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\n<div id=\"mac\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"mac-tab\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-PST-Compress-Compact-Mac.dmg\"><i class=\"icon-apple\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/mac-pst-compression.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 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\/how-to-compress-pst-file\/#Why_Compact_PST_File_How_It_Grows_Large\" >Why Compact PST File? How It Grows Large?<\/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\/how-to-compress-pst-file\/#Effective_Ways_to_Compress_PST_Files_Fix_Slow_Outlook\" >Effective Ways to Compress PST Files &amp; Fix Slow Outlook&nbsp;<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#Manually_Compress_Outlook_PST_Files\" >Manually Compress Outlook PST Files<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#Automatically_Compress_PST_Files\" >Automatically Compress PST Files&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#Which_Method_is_Best_to_Compact_PST_File\" >Which Method is Best to Compact PST File?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_Compact_PST_File_How_It_Grows_Large\"><\/span>Why Compact PST File? How It Grows Large?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If MS Outlook performance is sluggish, slow, or doesn&rsquo;t open correctly, hangs in between, then undoubtedly, an oversized PST is the cause. If you <a href=\"https:\/\/www.sysinfotools.com\/blog\/repair-oversized-outlook-pst-file\/\" target=\"_blank\" rel=\"noopener\"><strong>repair oversized Outlook PST file<\/strong><\/a>, then it can help reduce the consumed storage space and improve Outlook performance as well. It is quite similar to clearing digital clutter more by archiving and not by deleting important data.&nbsp;<\/p>\n<p>Some common reasons why a PST file tends to expand are:&nbsp;<\/p>\n<ul>\n<li aria-level=\"1\">Years of emails and contacts stored altogether<\/li>\n<li aria-level=\"1\">Data from multiple Outlook profiles is combined in one<\/li>\n<li aria-level=\"1\">Numerous sent and received attachments accumulate&nbsp;<\/li>\n<li aria-level=\"1\">Deleted emails still remain in trash or junk folders and aren&rsquo;t removed entirely&nbsp;<\/li>\n<li aria-level=\"1\">The Auto-Archival feature is disabled, which doesnt clears the space for new emails&nbsp;<\/li>\n<\/ul>\n<p>So, it is quite essential to compress them instead of deleting them to completely free the allocated space and prevent Outlook or file crashes, corruption, and other issues.&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Effective_Ways_to_Compress_PST_Files_Fix_Slow_Outlook\"><\/span>Effective Ways to Compress PST Files &amp; Fix Slow Outlook&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In this section of the blog, go through all the free and professional methods to compress and compact PSTs to improve performance. These are discussed in full detail here for easy understanding and quick implementation.&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Manually_Compress_Outlook_PST_Files\"><\/span>Manually Compress Outlook PST Files<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>We are going with two different free methods for compacting PST files to a smaller size that is acceptable and doesn&rsquo;t affect performance.&nbsp;<\/p>\n<h4>Way 1: Compact PST with Built-in Feature&nbsp;<\/h4>\n<ol>\n<li aria-level=\"1\">Open <strong>Outlook<\/strong> and move to <strong>File<\/strong> and click <strong>Account Settings<\/strong>.&nbsp;<\/li>\n<li aria-level=\"1\">Again, press <strong>Account Settings, <\/strong>and a dialog appears.&nbsp;<\/li>\n<li aria-level=\"1\">Then, go to the <strong>Data Files<\/strong> tab and select your oversized <strong>PST.<\/strong>&nbsp;<\/li>\n<li aria-level=\"1\">Further, click <strong>Settings<\/strong> from the options, and a dialog appears.&nbsp;<\/li>\n<li aria-level=\"1\">Finally, press <strong>Compact Now<\/strong> to reduce the size of the file.&nbsp;<\/li>\n<\/ol>\n<p><strong>Note: <\/strong>With this, only the unused white spaces are removed, and the emails aren&rsquo;t deleted. It is best if your PST file size is moderate and you are maintaining them regularly.&nbsp;<\/p>\n<h4>Way 2: Compress Outlook Data File by Archive<\/h4>\n<ol>\n<li aria-level=\"1\">In the<strong> File &rarr; Info &rarr; Tools<\/strong>, click on <strong>Clean Up Old Items<\/strong>.&nbsp;<\/li>\n<li aria-level=\"1\">It will open the <strong>Archive <\/strong>dialog where you can pick a<strong> date range.&nbsp;<\/strong><\/li>\n<li aria-level=\"1\">Then, select<strong> folders<\/strong> for archival and save them to a new<strong> PST.&nbsp;<\/strong><\/li>\n<li aria-level=\"1\">Alternatively, you can enable <strong>Auto-Archive<\/strong> or<strong> set an archive folder.&nbsp;<\/strong><\/li>\n<\/ol>\n<p><strong>Note: <\/strong>For long email histories, it is an efficient option without the actual deletion of emails.&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Automatically_Compress_PST_Files\"><\/span>Automatically Compress PST Files&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When the PST files are extremely large in size, or Outlook is too unstable, then a professional solution is an optimal choice. <strong>SysInfo PST Compress and Compact Tool <\/strong>is a smart and dependable utility to reduce the PST size without Outlook installation. It ensures that the data fidelity is preserved, and you can even secure it with passwords. Additionally, the tool offers support for all ANSI and UNICODE PSTs for any Outlook version and works flawlessly on both Mac and Windows. Moreover, it enables batch compression and has a <strong>Demo Version <\/strong>for evaluation.&nbsp;<\/p>\n<h4>Steps to Quick Compress Outlook Data File<\/h4>\n<ol class=\"wp-block-list\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Launch the <\/span><strong>PST Compress Tool<\/strong><span style=\"font-weight: 400;\"> and pick <\/span><strong>Single or Multiple Files<\/strong><span style=\"font-weight: 400;\"> and tap <\/span><strong>Next<\/strong><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ol>\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1221\" style=\"margin: 20px 0; border: 1px solid;\" src=\"https:\/\/www.sysinfotools.com\/asset\/img\/screenshot\/pst-compress-and-compact\/step-1.webp\" alt=\"Step 1 Launch the PST Compress Tool\" width=\"700\" height=\"984\" \/><\/figure>\n<ol class=\"wp-block-list\" start=\"2\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Then, press <\/span><strong>Select File\/Select Folder<\/strong><span style=\"font-weight: 400;\"> and upload <\/span><strong>PST<\/strong><span style=\"font-weight: 400;\"> files to compact. Click <\/span><strong>Next<\/strong><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ol>\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1222\" style=\"margin: 20px 0; border: 1px solid;\" src=\"https:\/\/www.sysinfotools.com\/asset\/img\/screenshot\/pst-compress-and-compact\/step-2.webp\" alt=\"Step 2 press Select File\/Select Folder and upload PST files\" width=\"700\" height=\"984\" \/><\/figure>\n<ol class=\"wp-block-list\" start=\"3\">\n<li><span style=\"font-weight: 400;\">Further, preview the data within the PST file, select folders from the tree, and click <\/span><strong>Next<\/strong><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ol>\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1225\" style=\"margin: 20px 0; border: 1px solid;\" src=\"https:\/\/www.sysinfotools.com\/asset\/img\/screenshot\/pst-compress-and-compact\/step-3.webp\" alt=\"step 3 preview the data within the PST file\" width=\"700\" height=\"984\" \/><\/figure>\n<ol class=\"wp-block-list\" start=\"4\">\n<li><span style=\"font-weight: 400;\">After that, choose how you want to <\/span><strong>compress the file<\/strong><span style=\"font-weight: 400;\"> and manage the resulting file.<\/span><\/li>\n<\/ol>\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1223\" style=\"margin: 20px 0; border: 1px solid;\" src=\"https:\/\/www.sysinfotools.com\/asset\/img\/screenshot\/pst-compress-and-compact\/step-4.webp\" alt=\"Step 4 choose how you want to compress the file\" width=\"700\" height=\"984\" \/><\/figure>\n<ol class=\"wp-block-list\" start=\"5\">\n<li><span style=\"font-weight: 400;\">Finally, select your <\/span><strong>destination path<\/strong><span style=\"font-weight: 400;\"> and click <\/span><strong>Start Compression<\/strong><span style=\"font-weight: 400;\"> to reduce the oversized PST.<\/span><\/li>\n<\/ol>\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1223\" style=\"margin: 20px 0; border: 1px solid;\" src=\"https:\/\/www.sysinfotools.com\/asset\/img\/screenshot\/pst-compress-and-compact\/step-6.webp\" alt=\"Step 5 select your destination path and click Start\" width=\"700\" height=\"984\" \/><\/figure>\n<p>That&rsquo;s how straightforward this process is with the easy-to-use interface. It is particularly useful if your organization has multiple mailboxes, legacy archives, oversized PSTs, and requires bulk compression at once with data safety.&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Which_Method_is_Best_to_Compact_PST_File\"><\/span>Which Method is Best to Compact PST File?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>From the distinction table below, you can identify which is the best way for PST compression:&nbsp;<\/p>\n<table border=\"1\">\n<tbody>\n<tr>\n<td>\n<p><strong>Basis&nbsp;<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Outlook Compact Feature&nbsp;<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>MS Outlook Archival<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>SysInfo PST Compact Tool<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Technical Skills<\/strong><\/p>\n<\/td>\n<td>\n<p>Required&nbsp;<\/p>\n<\/td>\n<td>\n<p>Somewhat<\/p>\n<\/td>\n<td>\n<p>Not required<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Outlook Installation<\/strong><\/p>\n<\/td>\n<td>\n<p>Mandatory<\/p>\n<\/td>\n<td>\n<p>Mandatory<\/p>\n<\/td>\n<td>\n<p>Not Mandatory<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Support for Large PSTs<\/strong><\/p>\n<\/td>\n<td>\n<p>Somewhat<\/p>\n<\/td>\n<td>\n<p>Somewhat<\/p>\n<\/td>\n<td>\n<p>Completely<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Batch Compression<\/strong><\/p>\n<\/td>\n<td>\n<p>No<\/p>\n<\/td>\n<td>\n<p>No&nbsp;<\/p>\n<\/td>\n<td>\n<p>Yes<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Speed<\/strong><\/p>\n<\/td>\n<td>\n<p>Slow<\/p>\n<\/td>\n<td>\n<p>Slow<\/p>\n<\/td>\n<td>\n<p>Fast<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Risk<\/strong><\/p>\n<\/td>\n<td>\n<p>Moderate<\/p>\n<\/td>\n<td>\n<p>Moderate<\/p>\n<\/td>\n<td>\n<p>Low (Demo Test Available)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><span id=\"Conclusion\" class=\"ez-toc-section\"><\/span><span id=\"Conclusion\" class=\"ez-toc-section\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If your Outlook startup is low, the search function is lagging, you receive Outlook not responding issue, or the PST size has exceeded 10-20 GB. Then, it is quite important to compress PST files to avoid Outlook instability and resolve slow Outlook issues. With proper compression and compaction on a regular basis, you can ensure steady Outlook performance, reduced clutter, and free storage. The manual fixes may help to some extent, but for a scalable solution, get the automated software.<\/p>\n<h4 class=\"faq_heading\">Frequently Asked Questions<\/h4>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1772090800806\"><strong class=\"schema-faq-question\">Q1. How to compress PST file without Outlook?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>To compress your PSTs without Outlook, download SysInfo PST File Compact Tool.\u00a0<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772090820627\"><strong class=\"schema-faq-question\">Q2. Does compressing a PST file delete emails or attachments?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>No, compressing PST doesn\u2019t necessarily mean your emails and attachments are deleted until you explicitly remove them.\u00a0<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772090838707\"><strong class=\"schema-faq-question\">Q3. Is there an automated tool to compress PST files safely?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>Yes. There is an Outlook PST Compress &amp; Compact Software by SysInfo, which functions offline, is highly secure, requires no Outlook, and allows batch compression.\u00a0<br><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772090855675\"><strong class=\"schema-faq-question\">Q4. Can large PST files cause Outlook to crash?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans. <\/strong>Yes. Large oversized PSTs are a prominent cause for Outlook crashes, as it slows the performance and corrupt the data, especially if you are working on older systems.\u00a0<br><\/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;20&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;12&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;4.3&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;4.3\\\/5 - (12 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Simple Ways to Compress PST Files \\u0026amp; Fix Slow Outlook Issues&quot;,&quot;width&quot;:&quot;122.2&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: 122.2px;\">\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            4.3\/5 - (12 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>The biggest productivity killer in Outlook is an oversized PST file, which doesn\u2019t allow users to easily access their data<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":21035,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[528],"tags":[1767,468],"class_list":["post-20","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mail-management","tag-compress-outlook-pst-file","tag-compress-pst-file"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Simple Ways to Compress PST Files &amp; Fix Slow Outlook Issues<\/title>\n<meta name=\"description\" content=\"Simple ways to Compress PST Files and fix slow Outlook issues. Reduce file size, improve performance, and prevent corruption with easy steps.\" \/>\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\/how-to-compress-pst-file\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Simple Ways to Compress PST Files &amp; Fix Slow Outlook Issues\" \/>\n<meta property=\"og:description\" content=\"Simple ways to Compress PST Files and fix slow Outlook issues. 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How to compress PST file without Outlook?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>To compress your PSTs without Outlook, download SysInfo PST File Compact Tool.\u00a0<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#faq-question-1772090820627","position":2,"url":"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#faq-question-1772090820627","name":"Q2. Does compressing a PST file delete emails or attachments?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>No, compressing PST doesn\u2019t necessarily mean your emails and attachments are deleted until you explicitly remove them.\u00a0<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#faq-question-1772090838707","position":3,"url":"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#faq-question-1772090838707","name":"Q3. Is there an automated tool to compress PST files safely?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>Yes. There is an Outlook PST Compress &amp; Compact Software by SysInfo, which functions offline, is highly secure, requires no Outlook, and allows batch compression.\u00a0<br>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#faq-question-1772090855675","position":4,"url":"https:\/\/www.sysinfotools.com\/blog\/how-to-compress-pst-file\/#faq-question-1772090855675","name":"Q4. Can large PST files cause Outlook to crash?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans. <\/strong>Yes. Large oversized PSTs are a prominent cause for Outlook crashes, as it slows the performance and corrupt the data, especially if you are working on older systems.\u00a0<br>","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/posts\/20","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/comments?post=20"}],"version-history":[{"count":19,"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/posts\/20\/revisions"}],"predecessor-version":[{"id":21037,"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/posts\/20\/revisions\/21037"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/media\/21035"}],"wp:attachment":[{"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/media?parent=20"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/categories?post=20"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sysinfotools.com\/blog\/wp-json\/wp\/v2\/tags?post=20"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}