{"id":14293,"date":"2023-10-06T07:04:54","date_gmt":"2023-10-06T07:04:54","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=14293"},"modified":"2025-01-25T09:37:21","modified_gmt":"2025-01-25T09:37:21","slug":"how-to-remove-duplicate-emails-from-ost-file","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/how-to-remove-duplicate-emails-from-ost-file\/","title":{"rendered":"How to Remove Duplicate Emails from OST File &#8211; DIY Approach"},"content":{"rendered":"<div class=\"block_sum\">\r\n  <p><strong>Summary:<\/strong> People often search for ways to remove duplicate emails from OST files but can rely on none. Also, eliminating duplicates creates a risk of losing unique files. Therefore, using <a href=\"https:\/\/www.sysinfotools.com\/ost-to-pst-converter.php\"><strong>OST to PST Converter<\/strong><\/a> is the only solution without any risk. Moreover, you can further import PST to Outlook easily. Besides, Outlook also provides a Cleanup feature to get it done. We will compare both the procedures and find the perfect solution for users. In addition, let us see what are the causes for the duplication of emails in Outlook OST.\r\n<\/p>\r\n<div class=\"blog-btn\">\r\n<ul id=\"db-btn-container\" class=\"nav nav-tabs mt-4\" role=\"tablist\">\r\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>\r\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>\r\n<\/ul>\r\n<div id=\"db-btn-containerContent\" class=\"tab-content my-2\">\r\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-OST-to-PST-Converter-Demo.exe\"><i class=\"icon-windows\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/ost-to-pst-converter.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\r\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\/Sysinfo-Mac-OST-to-PST-for-Mac.dmg\"><i class=\"icon-apple\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/mac\/ost-to-pst-converter\/buy.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\r\n<\/div><\/div><\/div>\r\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-remove-duplicate-emails-from-ost-file\/#What_Are_the_Causes_of_Duplicate_Emails_in_OST_File\" >What Are the Causes of Duplicate Emails in OST File?<\/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-remove-duplicate-emails-from-ost-file\/#Best_Way_to_Remove_Duplicate_Emails_from_OST_Files\" >Best Way to Remove Duplicate Emails from OST Files<\/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-remove-duplicate-emails-from-ost-file\/#Steps_to_Use_Software\" >Steps to Use Software<\/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-remove-duplicate-emails-from-ost-file\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_the_Causes_of_Duplicate_Emails_in_OST_File\"><\/span>What Are the Causes of Duplicate Emails in OST File?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>To better understand how to delete duplicate items from Outlook OST files, it is important to learn the reason behind them. So, below are some reasons why duplicates are created in Outlook OST files:<\/p>\r\n<ul>\r\n<li>IMAP interval is less than 15 minutes.<\/li>\r\n<li>Outlook Profile corruption causing synchronization problems.<\/li>\r\n<li>Improper Network Connection.<\/li>\r\n<li>Access to multiple mailboxes on a single Outlook.<\/li>\r\n<li>Anti-virus or security software.<\/li>\r\n<li>Bugs or Glitch in Outlook.<\/li>\r\n<li>Improper migration of emails.<\/li>\r\n<\/ul>\r\n<p>So, due to these reasons, duplicate items are created in the OST file. However, why is it too important to remove duplicate items from Outlook OST? Here is why.<\/p>\r\n<p>Duplicate emails firstly consume your valuable storage and this may affect the productivity of the mailbox. Other than that, as soon as you start the application the message stored on the server gets reloaded creating performance issues and errors. Moreover, the duplication results in oversized OST files, ultimately leading to OST file corruption. And if you remove duplicates manually it can be a tedious and time-consuming process. So, we have suggested an alternative method to do the job easily with less effort.<\/p>\r\n<p>Therefore, let us move to the most important section that is what is the process of removing duplicate emails from the OST file.<\/p>\r\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Best_Way_to_Remove_Duplicate_Emails_from_OST_Files\"><\/span>Best Way to Remove Duplicate Emails from OST Files<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>While searching for the best solution to <strong>delete duplicate emails from Outlook OST files<\/strong>, you might have come across the <strong>OST to PST Converter<\/strong>. Using this tool, you can efficiently remove duplicate emails from any number of OST files within no time. The tool is designed to <a href=\"https:\/\/www.sysinfotools.com\/blog\/convert-ost-file-to-pst\/\"><strong>convert OST file to PST<\/strong><\/a> and other file formats but it has some built-in features that enhances the user experience. One such feature is to remove duplicate emails while migrating. However, you will receive the resultant file in PST file format. Or you can directly import the OST file into Outlook. It removes all duplicate emails from multiple OST files without any hassle. This utlity also helps to solve <a href=\"https:\/\/www.sysinfotools.com\/blog\/fix-outlook-error-code-0x80072f06\/\"><strong>Outlook Error Code 0x80072f06<\/strong><\/a>.<\/p>\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Use_Software\"><\/span>Steps to Use Software<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Follow the stepwise process mentioned below to delete duplicate emails from OST files:<\/p>\r\n<ol>\r\n<li>Download and run the SysInfo OST to PST converter.<\/li>\r\n<li>Either choose the <strong>Select Folder<\/strong> or the <strong>Single File\/Multiple Files<\/strong> option and click <strong>Next.<\/strong><\/li>\r\n<li>Next, click on <strong>Select Files<\/strong> or <strong>Select Folders<\/strong> to add the desired OST file.<\/li>\r\n<li>Select OST files from File Explorer and open it. Click <strong>Next.<\/strong><\/li>\r\n<li>Now, select the OST files in the preview section and click <strong>Next.<\/strong><\/li>\r\n<li>On the next screen, choose the desired saving options as PST or any other file format you want your resultant file into.<\/li>\r\n<li>Out of the different options to customize your resultant file, choose the <strong>Remove Duplicate <\/strong>option.<\/li>\r\n<li>At last, click <strong>Convert<\/strong> to delete duplicate items from Outlook OST Files.<\/li>\r\n<\/ol>\r\n<p>Besides, the tool has a free demo version to help users evaluate the working of the tool and its functionalities. You can also migrate 50 emails per folder using the free tool. Therefore, the tool the OST to PST converter is the best choice for all users.<\/p>\r\n<p>Also, if you want to remove duplicates from the PST file, go for the <a href=\"https:\/\/www.sysinfotools.com\/recovery\/outlook-duplicate-remover.php\" target=\"_blank\" rel=\"noreferrer noopener\">Outlook Duplicate Remover<\/a> tool. This is also reliable software for removing duplicate emails from multiple PST files at once.<\/p>\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Duplicates unnecessarily occupy the mailbox space. So, it is important to <strong>remove duplicate emails from OST files<\/strong> that help you manage mailbox data, save storage space, and improve productivity. However, it is important to choose the best approach to do so because it is a matter of crucial data. Hence, we have discussed one of the most secure and trustworthy methods to remove duplicates.<\/p>\r\n<h4 class=\"faq_heading\">Frequently Asked Questions<\/h4>\r\n<!-- \/wp:post-content -->\r\n\r\n<!-- wp:yoast\/faq-block {\"questions\":[{\"id\":\"faq-question-1696575366487\",\"question\":[\"Q. Can I delete duplicate Outlook data files?\"],\"answer\":[\"Yes, you can \",{\"type\":\"strong\",\"props\":{\"children\":[\"remove duplicate emails from OST files\"]}},\". If you have to deal with a few emails, you can manually identify them and delete them. But for a significant number of OST files, using any third-party utility is a better option.\"],\"jsonQuestion\":\"Q. Can I delete duplicate Outlook data files?\",\"jsonAnswer\":\"Yes, you can \\u003cstrong\\u003eremove duplicate emails from OST files\\u003c\/strong\\u003e. If you have to deal with a few emails, you can manually identify them and delete them. But for a significant number of OST files, using any third-party utility is a better option.\"},{\"id\":\"faq-question-1696575377889\",\"question\":[\"Q. What is the best duplicate remover for Outlook OST Files?\"],\"answer\":[\"The best approach to remove duplicate items from Outlook OST is using a professional tool. Because Outlook provides no built-in feature to remove duplicates from Outlook Data File. Moreover, the Outlook Duplicate remover is a secure and reliable tool.\"],\"jsonQuestion\":\"Q. What is the best duplicate remover for Outlook OST Files?\",\"jsonAnswer\":\"The best approach to remove duplicate items from Outlook OST is using a professional tool. Because Outlook provides no built-in feature to remove duplicates from Outlook Data File. Moreover, the Outlook Duplicate remover is a secure and reliable tool.\"}]} -->\r\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1696575366487\"><strong class=\"schema-faq-question\">Q. Can I delete duplicate Outlook data files?<\/strong> <p class=\"schema-faq-answer\">Yes, you can <strong>remove duplicate emails from OST files<\/strong>. If you have to deal with a few emails, you can manually identify them and delete them. But for a significant number of OST files, using any third-party utility is a better option.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1696575377889\"><strong class=\"schema-faq-question\">Q. What is the best duplicate remover for Outlook OST Files?<\/strong> <p class=\"schema-faq-answer\">The best approach to remove duplicate items from Outlook OST is using a professional tool. Because Outlook provides no built-in feature to remove duplicates from Outlook Data File. Moreover, the Outlook Duplicate remover is a secure and reliable tool.<\/p> <\/div> <\/div>\r\n<!-- \/wp:yoast\/faq-block -->\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;14293&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;4&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 - (4 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;How to Remove Duplicate Emails from OST File - DIY Approach&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 - (4 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: People often search for ways to remove duplicate emails from OST files but can rely on none. Also, eliminating<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/how-to-remove-duplicate-emails-from-ost-file\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":16113,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1588],"tags":[1759,1757,1758],"class_list":["post-14293","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ms-outlook","tag-delete-duplicate-items-from-outlook-ost-files","tag-how-to-remove-duplicate-emails-from-ost-file","tag-remove-duplicate-emails-from-ost-file"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Remove Duplicate Emails from OST File - DIY Approach<\/title>\n<meta name=\"description\" content=\"Trying to remove duplicate emails from OST file? 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