{"id":328,"date":"2022-11-10T11:54:47","date_gmt":"2022-11-10T11:54:47","guid":{"rendered":"https:\/\/www.mailvita.com\/kb\/?p=328"},"modified":"2022-11-10T12:09:23","modified_gmt":"2022-11-10T12:09:23","slug":"reduce-ost-file-size-in-ms-outlook-2021","status":"publish","type":"post","link":"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/","title":{"rendered":"Reduce OST File Size in MS Outlook 2021, 2019, 2016, and 2013"},"content":{"rendered":"<p>Seeking a way to reduce the size of Outlook OST file. This article describes the best methods to manage large-sized OST files, avoiding OST file corruption, and other problems in Outlook.<\/p>\n<p>Generally, Microsoft Outlook creates a copy of mailbox data which is known as OST file and is created if the user configures the Outlook account with IMAP or Exchange Server.<\/p>\n<p style=\"text-align: center;\"><a class=\"maxbutton-1 maxbutton maxbutton-download-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.mailvita.com\/dl\/osttopst.dmg\"><span class='mb-text'>Download Now on Mac<\/span><\/a>\u00a0 \u00a0 \u00a0 \u00a0<a class=\"maxbutton-2 maxbutton maxbutton-buy-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.mailvita.com\/ost-to-pst-converter-for-mac\/buy\/\"><span class='mb-text'>Buy Now on Mac<\/span><\/a><\/p>\n<p>This OST file is highly useful in case of a slow internet connection or no internet connection. If there is an interruption in the internet connection due to any reason, you can still access your mailbox data without connecting to the server.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_67_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\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.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Consequences_of_Large_OST_files\" title=\"Consequences of Large OST files\">Consequences of Large 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-2\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Methods_to_reduce_OST_file_size_in_Microsoft_Outlook\" title=\"Methods to reduce OST file size in Microsoft Outlook\">Methods to reduce OST file size in Microsoft Outlook<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Reduce_the_number_of_cached_emails\" title=\"Reduce the number of cached emails\">Reduce the number of cached emails<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Compact_OST_file\" title=\"Compact OST file\">Compact OST file<\/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.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Switch_Outlook_to_Online_mode\" title=\"Switch Outlook to Online mode\">Switch Outlook to Online mode<\/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.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Delete_duplicates_from_OST_file\" title=\"Delete duplicates from OST file\">Delete duplicates from OST file<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Clean_up_mailbox_data\" title=\"Clean up mailbox data\">Clean up mailbox data<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Transfer_mail_items_from_Outlook_OST_file_to_PST_or_archive_folder\" title=\"Transfer mail items from Outlook OST file to PST or archive folder\">Transfer mail items from Outlook OST file to PST or archive folder<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Automated_Solution_to_reduce_Outlook_OST_file_size\" title=\"Automated Solution to reduce Outlook OST file size\">Automated Solution to reduce Outlook OST file size<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Only_a_few_basic_steps_are_involved_with_this_software_for_data_conversion\" title=\"Only a few basic steps are involved with this software for data conversion:\">Only a few basic steps are involved with this software for data conversion:<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Consequences_of_Large_OST_files\"><\/span>Consequences of Large OST files<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Generally, large OST mailbox data slow down the Outlook program, file corruption, and many other issues. Also, it creates many errors such as:<\/p>\n<ul>\n<li>The outlook application is not responding<\/li>\n<li>Can\u2019t add additional data to existing Exchange .ost file<\/li>\n<li>Delay in opening the OST file<\/li>\n<li>Retrieving data from Exchange Server<\/li>\n<li>Stuck with a message requesting data from Exchange Server<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Methods_to_reduce_OST_file_size_in_Microsoft_Outlook\"><\/span>Methods to reduce OST file size in Microsoft Outlook<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you are having issues with an oversized OST file, then in this part of the post, we are going to explain some effective ways to decrease the size of OST file as this will help you to improve the performance and workflow of MS Outlook email client.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Reduce_the_number_of_cached_emails\"><\/span>Reduce the number of cached emails<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Whenever a user creates new Outlook profile then it is set by default to keep all email offline. So, when all emails are stored on the server, there is no need to save all email messages offline as unnecessary emails will consume space in the mailbox.<\/p>\n<p>To decrease OST file size, you can change the number of emails that are cached from all to 4 or 1 month. With the discussed steps, you can change the cached emails.<\/p>\n<ol>\n<li>Open the Outlook email client<\/li>\n<li>Go to the File option and then on Info<\/li>\n<li>Pick the Account Setting option and again the Account Settings option. Then, choose the email address.<\/li>\n<li>Hit on the Change button.<\/li>\n<li>Now, decrease the use cached mode to 5 or 1 month.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Compact_OST_file\"><\/span>Compact OST file<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To compact the OST file in Outlook, the steps are listed below:<\/p>\n<ol>\n<li>Initially, launch the Outlook email client and hit the File tab<\/li>\n<li>Now, pick the Info option<\/li>\n<li>Go to the Account Settings and again click on the Account Settings<\/li>\n<li>Hit on More Settings option and then on Advanced<\/li>\n<li>Now, choose Outlook data file settings<\/li>\n<li>Finally, hit Compact Now and then OK to finish the process<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Switch_Outlook_to_Online_mode\"><\/span>Switch Outlook to Online mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>As we mentioned earlier when we create a new Outlook profile, it is set by default to keep all the emails offline. So, you can use Outlook in online mode which keeps the connection to the server and you can view the data items there. If you use Outlook in online mode then it won\u2019t store items locally on the computer. As a result, the OST file will not become oversized and won\u2019t get corrupted.<\/p>\n<p>Steps to enable Outlook to online mode:<\/p>\n<ol>\n<li>Start by opening MS Outlook email client. Then, go to the File option.<\/li>\n<li>Go for the Info option and then select Account Settings twice<\/li>\n<li>Pick the email address and hit the Change option.<\/li>\n<li>Unmark Use Cached Exchange Mode. Then, click on the Next button and restart the Outlook program.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Delete_duplicates_from_OST_file\"><\/span>Delete duplicates from OST file<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Duplicate items are major factors to increase the size of Outlook OST file. So, by deleting duplicate data items from OST file, you can decrease OST file size. For this, we don\u2019t recommend manual solutions. Instead of manual approaches, you should go for an effective third-party solution to remove OST duplicate emails and other items.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Clean_up_mailbox_data\"><\/span>Clean up mailbox data<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>By cleaning up the mailbox data, one can somehow reduce Outlook OST file size.<\/p>\n<ol>\n<li>Start with MS Outlook program<\/li>\n<li>Navigate to the File tab and then go to the Info tab<\/li>\n<li>Hit the Mailbox Clean up under Tools icon<\/li>\n<li>Now, click on the View mailbox size button to view the current mailbox size stored in OST file.<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"Transfer_mail_items_from_Outlook_OST_file_to_PST_or_archive_folder\"><\/span>Transfer mail items from Outlook OST file to PST or archive folder<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>By this method, users can keep old emails of OST file by transferring them into PST file. This will help users to diminish OST file size without any loss of data.<\/p>\n<ol>\n<li>Open the Outlook email client and then navigate to the File option.<\/li>\n<li>Go to Tools and then on Clean up old emails<\/li>\n<li>Now, check the option \u2018Archive this folder &amp; all subfolders\u2019<\/li>\n<li>Pick the folder you need to archive<\/li>\n<li>Now, use the Browse button and select the path to save the archive file. Press the OK button.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Automated_Solution_to_reduce_Outlook_OST_file_size\"><\/span>Automated Solution to reduce Outlook OST file size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If users want a swift and reliable solution, they can choose <strong>Mailvita <a href=\"https:\/\/www.mailvita.com\/ost-to-pst-converter-for-mac\/\">OST to PST Converter for Mac<\/a>. <\/strong>This is an excellent program to transfer OST files all emails &amp; other data into PST files on Mac as well as on Windows platforms. It is very simple to use and is available at affordable prices. During the data transfer, it properly maintains the database structure and every detail of the source OST file. Without even opening the Outlook program, users can move OST mailbox data into PST file format on Mac and Windows all versions.<\/p>\n<p style=\"text-align: center;\"><a class=\"maxbutton-1 maxbutton maxbutton-download-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.mailvita.com\/dl\/win\/osttopstdemo.exe\"><span class='mb-text'>Download Now on Win<\/span><\/a> \u00a0\u00a0 \u00a0 \u00a0<a class=\"maxbutton-2 maxbutton maxbutton-buy-now\" target=\"_blank\" rel=\"nofollow noopener\" href=\"https:\/\/www.mailvita.com\/ost-to-pst-converter-for-mac\/win-buy\/\"><span class='mb-text'>Buy Now on Mac<\/span><\/a><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Only_a_few_basic_steps_are_involved_with_this_software_for_data_conversion\"><\/span>Only a few basic steps are involved with this software for data conversion:<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>Firstly, start the automated program on Mac or on Windows OS.<\/li>\n<li>Now, use the <strong>Browse<\/strong> option to <strong>add the source OST file<\/strong> whose size you want to reduce.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-330 size-full\" src=\"https:\/\/www.mailvita.com\/kb\/wp-content\/uploads\/2022\/11\/ost-to-pst1.jpg\" alt=\"ost-to-pst\" width=\"692\" height=\"608\" srcset=\"https:\/\/www.mailvita.com\/kb\/wp-content\/uploads\/2022\/11\/ost-to-pst1.jpg 692w, https:\/\/www.mailvita.com\/kb\/wp-content\/uploads\/2022\/11\/ost-to-pst1-300x264.jpg 300w\" sizes=\"auto, (max-width: 692px) 100vw, 692px\" \/><\/p>\n<ul>\n<li>After <strong>selecting OST file<\/strong>, check its data in the <strong>preview<\/strong> pane.<\/li>\n<li>After this, assign a path on your system to <strong>save the resultant PST file<\/strong>.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-331 size-full\" src=\"https:\/\/www.mailvita.com\/kb\/wp-content\/uploads\/2022\/11\/convert-ost-to-pst1.jpg\" alt=\"convert-ost\" width=\"692\" height=\"608\" srcset=\"https:\/\/www.mailvita.com\/kb\/wp-content\/uploads\/2022\/11\/convert-ost-to-pst1.jpg 692w, https:\/\/www.mailvita.com\/kb\/wp-content\/uploads\/2022\/11\/convert-ost-to-pst1-300x264.jpg 300w\" sizes=\"auto, (max-width: 692px) 100vw, 692px\" \/><\/p>\n<ul>\n<li>Hit the <strong>Generate Now<\/strong> button to commence the conversion process.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Through this write-up, you can check out all possible ways to reduce large-size OST files. We have explained manual tricks and an automated program that works on both Mac &amp; Windows OS. Using these techniques, you can get rid of huge size OST files. Check out the software working by installing the free demo version.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Seeking a way to reduce the size of Outlook OST file. This article describes the best methods to manage large-sized OST files, avoiding OST file corruption, and other problems in Outlook. Generally, Microsoft Outlook creates a copy of mailbox data which is known as OST file and is created if the user configures the Outlook&#8230;<\/p>\n<p class=\"more-link-wrap\"><a href=\"https:\/\/www.mailvita.com\/kb\/reduce-ost-file-size-in-ms-outlook-2021\/\" class=\"more-link\">Read More<span class=\"screen-reader-text\"> &ldquo;Reduce OST File Size in MS Outlook 2021, 2019, 2016, and 2013&rdquo;<\/span> &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ost-converter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Possible Methods to Reduce OST File Size In MS Outlook 2021<\/title>\n<meta name=\"description\" content=\"Check out all methods to reduce OST file size in MS Outlook. 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