{"id":4897,"date":"2024-12-11T11:22:45","date_gmt":"2024-12-11T11:22:45","guid":{"rendered":"https:\/\/www.macsonik.com\/blog\/?p=4897"},"modified":"2026-08-10T10:04:59","modified_gmt":"2026-08-10T10:04:59","slug":"compact-ost-file","status":"publish","type":"post","link":"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/","title":{"rendered":"How to Compact OST File Size &#8211; Step-by-Step-Guide"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;4897&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&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;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;How to Compact OST File Size - Step-by-Step-Guide&quot;,&quot;width&quot;:&quot;0&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: 0px;\">\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            <span class=\"kksr-muted\">Rate this post<\/span>\n    <\/div>\n    <\/div>\n\n<p class=\"user-query wp-block-paragraph\"><strong class=\"text-danger\">Summary:<\/strong> User issue<\/strong>: \u201c<em>A few days back, my MS Outlook account had problems in functioning. So, I backed up all my data into OST file format. But now, it occupies a large space of my system. Besides, I cannot delete them as they contain confidential data. Therefore, I was looking for a solution to compact OST files. However, it is difficult to do it on my own. Please help me out!\u201d<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Similarly, we found many users who are looking for the same. To solve this problem, we will discuss different methods including native and automated <\/em><a href=\"https:\/\/www.macsonik.com\/pst-compress\/\" target=\"_blank\"><strong><em>PST Compress Tool<\/em><\/strong><\/a><em>. Once you understand both procedures, choose the best approach that fits your requirements.&nbsp;<\/em><\/p>\n<div class=\"ms_btn_sec text-center my-3\"><a href=\"https:\/\/www.macsonik.com\/dl\/macsonik-pst-compress.dmg\"\" class=\"btn btn-download mr-3\"><i class=\"icon-download-1\"><\/i> Download Now<\/a><a href=\"https:\/\/www.macsonik.com\/pst-compress\/buy.php\" class=\"btn btn-buy\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/div>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87_1 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">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: #0a0a0a;color:#0a0a0a\" 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: #0a0a0a;color:#0a0a0a\" 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.macsonik.com\/blog\/compact-ost-file\/#Requirements_to_Compress_Outlook_OST_Files\" >Requirements to Compress Outlook OST Files<\/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.macsonik.com\/blog\/compact-ost-file\/#Simple_Methods_to_Compact_OST_File\" >Simple Methods to Compact OST File<\/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.macsonik.com\/blog\/compact-ost-file\/#_Use_Native_Technique_to_Reduce_OST_file_Size\" ># Use Native Technique to Reduce 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-4\" href=\"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/#Method_1_With_Outlook_Compact_Now_Feature\" >Method 1. With Outlook Compact Now Feature<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/#_Method_2_Cleanup_Mailbox_Feature\" >&nbsp;Method 2. Cleanup Mailbox Feature<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/#Method_3_Compact_OST_Using_Archive\" >Method 3. Compact OST Using Archive<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/#2_Shrink_Outlook_OST_File_%E2%80%93_With_Automated_Approach\" >#2 Shrink Outlook OST File &#8211; With Automated Approach<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/#Steps_to_Compress_Outlook_OST\" >Steps to Compress Outlook OST<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/#Ending_Thought\" >Ending Thought<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Requirements_to_Compress_Outlook_OST_Files\"><\/span>Requirements to Compress Outlook OST Files<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>It\u2019s necessary to understand the reasons for compressing OST files. So, you can freely compress them without any difficulty.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>If you have a large OST file, it will affect Outlook performance like slow processing which can delay opening emails, searching, or accessing your Outlook mailbox.\u00a0<\/em><\/li>\n\n\n\n<li><em>Compacting OST files creates more space on your system and improves its performance.<\/em><\/li>\n\n\n\n<li><em>When you have big OST files, it is more likely to be corrupted. To prevent it, you must regularly compress or keep the file size in check.\u00a0<\/em><\/li>\n\n\n\n<li><em>It helps you backup or synchronize the OST files easily and quickly if it is small in size.\u00a0<\/em><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Simple_Methods_to_Compact_OST_File\"><\/span>Simple Methods to Compact OST File<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Now, we have already discussed some common reasons to proceed with this process. Let\u2019s take a look at the ways to do this process quickly and smoothly.&nbsp;<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"_Use_Native_Technique_to_Reduce_OST_file_Size\"><\/span># Use Native Technique to Reduce OST file Size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Here, we will describe multiple manual solutions in detail.&nbsp;<\/em><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_1_With_Outlook_Compact_Now_Feature\"><\/span>Method 1. With Outlook Compact Now Feature<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><em>Open MS Outlook desktop-based email application > <\/em><strong><em>File<\/em><\/strong><em>.\u00a0<\/em><\/li>\n\n\n\n<li><em>After that, pick <\/em><strong><em>Account Settings <\/em><\/strong><em>> opt <\/em><strong><em>Account Settings <\/em><\/strong><em>again.<\/em><\/li>\n\n\n\n<li><em>Then, tap <\/em><strong><em>Data Files<\/em><\/strong><em> to see all the OST files in Outlook.<\/em><\/li>\n\n\n\n<li><em>Later, opt for OST that you want to compress. Hit <\/em><strong><em>Settings<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>Thereafter, open <\/em><strong><em>Advanced <\/em><\/strong><em>> <\/em><strong><em>Outlook Data File Settings<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>Now, select OST file > <\/em><strong><em>Compact Now<\/em><\/strong><em> > <\/em><strong><em>OK<\/em><\/strong><em>.<\/em><\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"_Method_2_Cleanup_Mailbox_Feature\"><\/span>&nbsp;Method 2. Cleanup Mailbox Feature<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><em>To use this feature, tap <\/em><strong><em>File <\/em><\/strong><em>>\u00a0 <\/em><strong><em>Tools <\/em><\/strong><em>and then choose <\/em><strong><em>Mailbox Cleanup<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>Now, hit the <\/em><strong><em>View Mailbox Size <\/em><\/strong><em>to know the file size.\u00a0<\/em><\/li>\n\n\n\n<li><em>Further, choose either option: <\/em><strong><em>Find items older than<\/em><\/strong><em> or <\/em><strong><em>Find items larger than<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>Next, remove the unnecessary emails according to your requirements.\u00a0<\/em><\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_3_Compact_OST_Using_Archive\"><\/span>Method 3. Compact OST Using Archive<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><em>Run the latest version of Outlook, click <\/em><strong><em>File <\/em><\/strong><em>and then <\/em><strong><em>Tools<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>Later, opt for <\/em><strong><em>Clean Up Old Items<\/em><\/strong><em>. Then, the Archive will be open.\u00a0<\/em><\/li>\n\n\n\n<li><em>Thereafter, choose the folder with OST files and then mention the date in the <\/em><strong><em>Archive items older than<\/em><\/strong><em> the dialogue box.\u00a0<\/em><\/li>\n\n\n\n<li><em>Further, set the path to save the archive file in your system.\u00a0<\/em><\/li>\n\n\n\n<li><em>Lastly, tap <\/em><strong><em>OK <\/em><\/strong><em>to archive old or unwanted OST files.<\/em><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><em>All the above methods are effective but it comes with many restrictions. It includes good technical expertise. Also, you can use it at your own risk as these solutions don&#8217;t provide a guarantee of data protection. Therefore, you can go for an alternative technique.&nbsp;<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Shrink_Outlook_OST_File_%E2%80%93_With_Automated_Approach\"><\/span>#2 Shrink Outlook OST File &#8211; With Automated Approach<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>MacSonik PST Compress Tool<\/em><\/strong><em> is an incredible utility, unlike the native procedure. With this solution, you can easily compact OST files even large or multiple OST files. Other than this, all users can use it without requiring additional assistance. Apart from this, it provides numerous advanced features to simplify the process. It includes compressing attachments in separate folders or removing them from compression, and other features. In addition, you can choose to eliminate duplicates from the process. Regardless of these features, it provides risk-free output in no time without putting in extra effort.&nbsp;<\/em><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Compress_Outlook_OST\"><\/span>Steps to Compress Outlook OST<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Now, we will provide a step-by-step guide to complete the process.&nbsp;<\/em><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><em>To begin, download and open the PST Compress Wizard.<\/em><\/li>\n\n\n\n<li><em>Next, select the <\/em><strong><em>OST <\/em><\/strong><em>as the file type.\u00a0<\/em><\/li>\n\n\n\n<li><em>Then, choose the <\/em><strong><em>mode of the file<\/em><\/strong><em>. Hit <\/em><strong><em>Next<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>Later, browse and choose the OST files for compression. Press <\/em><strong><em>Open to upload<\/em><\/strong><em> > <\/em><strong><em>Next<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>Further, preview and choose files for compression. Click <\/em><strong><em>Next<\/em><\/strong><em>.<\/em><\/li>\n\n\n\n<li><em>After that, assign the <\/em><strong><em>path to store the output file <\/em><\/strong><em>at the desired location.\u00a0<\/em><\/li>\n\n\n\n<li><em>In the end, press <\/em><strong><em>Start Compression<\/em><\/strong><em> to begin the compression process to reduce OST file Size<\/em><\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ending_Thought\"><\/span>Ending Thought<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Here, this blog provides multiple solutions to compact OST files. From the different methods, you can go for the most effective and reliable procedure which is a&nbsp; professional PST Compressor Tool. With this utility, you can easily compress multiple OST or PST files, unlike the manual techniques. Additionally, it preserves the original folder hierarchy throughout the process.&nbsp;<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Summary: User issue: \u201cA few days back, my MS Outlook account had problems in functioning. So, I backed up all<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.macsonik.com\/blog\/compact-ost-file\/\">Read More<\/a><\/p>\n","protected":false},"author":10,"featured_media":4898,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[99],"tags":[],"class_list":["post-4897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pst-compress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Compact OST File Size - Step-by-Step-Guide<\/title>\n<meta name=\"description\" content=\"Ready to Shrink Outlook OST File in 2025? 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