{"id":43679,"date":"2025-12-30T10:14:46","date_gmt":"2025-12-30T10:14:46","guid":{"rendered":"https:\/\/www.adviksoft.com\/blog\/?p=43679"},"modified":"2025-12-30T10:15:57","modified_gmt":"2025-12-30T10:15:57","slug":"microsoft-outlook-ost-file-too-big","status":"publish","type":"post","link":"https:\/\/www.adviksoft.com\/blog\/microsoft-outlook-ost-file-too-big\/","title":{"rendered":"Microsoft Outlook OST File Too Big? How to Fix It Easily"},"content":{"rendered":"<p>Are you unsure about how to handle the Outlook OST file too big issue? Well, fear not! In this guide, we will help you resolve errors related to OST files being too large. Here, we are going to explain multiple solutions that you can use to fix your query easily. So, stay tuned to understand the complete procedure.<\/p>\n<p>But before we move ahead, let&#8217;s take a moment to understand the causes you are facing with this issue.<\/p>\n<div class=\"red-border\">\n<h2>Why is my OST file so large? Know Here!<\/h2>\n<p>Large OST files can be caused by many factors, such as OST file mailbox size, large email attachments, cache mode, multiple account sync issues, and many more.<\/p>\n<p>So, now let&#8217;s understand these issues in more detail, so you will have a better clarity before you choose an appropriate method as per your concern.<\/p>\n<ul>\n<li><strong>Large Mailbox Size:<\/strong> If your email account has multiple emails, then it&#8217;s most probable that your OST file size will increase because of your large mailboxes.<\/li>\n<li><strong>Emails with Large Attachments:<\/strong> Sometimes, large email attachments can also cause to increase OST file size.<\/li>\n<li><strong>Cache Mode:<\/strong> When Outlook is in cache mode, it automatically saves complete data in OST file, leading to an increase in OST file size.<\/li>\n<li><strong>Multiple Accounts:<\/strong> When you add multiple email accounts in Outlook, it increases the amount of data in your OST file. And it makes the OST file too large to open or access.<\/li>\n<li><strong>Corrupted OST File:<\/strong> A damaged or inaccessible OST file can also cause abnormal growth in OST file size.<\/li>\n<\/ul>\n<\/div>\n<p>We hope that you have understood the major reasons that might be responsible for Outlook OST file too big issue.<\/p>\n<p>Now, let&#8217;s move on to learn the solutions that we have researched well, and we are presenting them.<\/p>\n<h2>Manual Tips to Fix Microsoft Outlook OST File Too Big Issue<\/h2>\n<p>Here are a few tried and tested ways you can try to deal with Outlook OST file size issue. So, go through each method one by one and then decide which one to choose as per your needs.<\/p>\n<h3>#1. Reduce Mail Sync Time<\/h3>\n<p>Here, you can create a limit on Outlook to fix how much email is stored offline.<\/p>\n<ol>\n<li>Open Outlook.<\/li>\n<li>Click on the File tab and choose Account Settings &gt;&gt; Account Settings.<\/li>\n<li>Select your email account, then click Change.<\/li>\n<li>Use the Mail to keep the offline slider.<\/li>\n<li>Choose sync duration as per your needs: 3 months \/ 6 months \/ 1 year.<\/li>\n<li>Click Next &gt;&gt; Finish and restart Outlook.<\/li>\n<\/ol>\n<p>This immediately reduces OST file size without deleting emails from the server.<\/p>\n<h3>#2. Remove Large Mail Items<\/h3>\n<p>Here, you have to delete emails with large attachments.<\/p>\n<ol>\n<li>Go to the <strong>File<\/strong> tab.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-43702\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/images-8-1.png\" alt=\"Go to the File tab\" width=\"206\" height=\"245\" \/><\/li>\n<li>Next, tap on the<strong> Tools<\/strong> and choose <strong>Mailbox Cleanup<\/strong>.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-43695\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/f185de1c-5c30-42aa-a48c-1d47dc23cdd2.png\" alt=\"click tools and choose Mailbox Cleanup\" width=\"370\" height=\"297\" \/><\/li>\n<li>Click <strong>View Mailbox Size<\/strong>.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-43703\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/view-mailbox-size.png\" alt=\"view mailbox size in Outlook\" width=\"400\" height=\"494\" \/><\/li>\n<li>Choose <strong>Find items larger than<\/strong> (e.g., 10 MB).\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43696\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/image-1.png\" alt=\"Choose Find items larger than\" width=\"527\" height=\"240\" srcset=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/image-1.png 826w, https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/image-1-768x350.png 768w\" sizes=\"auto, (max-width: 527px) 100vw, 527px\" \/><\/li>\n<li>Delete or archive unnecessary emails.\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43704\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/archive-delete.jpg\" alt=\"archive or delete emails to deal with outlook ost file too big size issue\" width=\"496\" height=\"226\" \/><\/li>\n<\/ol>\n<h3>#3. Archive Old Emails<\/h3>\n<p>Here, you have to move old emails out of the OST file to free out some space.<\/p>\n<p><strong>Step 1.<\/strong> Click the <strong>File<\/strong> tab in Outlook.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-43693\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/images-8.png\" alt=\"Click the File tab in Outlook\" width=\"206\" height=\"245\" \/><\/p>\n<p><strong>Step 2.<\/strong> Next, click <strong>Tools<\/strong> and choose <strong>Clean up old items<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-43694\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/images-7.png\" alt=\"click Tools and choose Clean up old items\" width=\"212\" height=\"238\" \/><\/p>\n<p><strong>Step 3.<\/strong> Select the required folders, date ranges, and click <strong>OK<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-43692 size-full\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/images-27.jpg\" alt=\"Select folders and fix outlook ost file too big size issue\" width=\"215\" height=\"234\" \/><\/p>\n<p><strong>Step 4.<\/strong> Choose the <strong>archive location<\/strong> and tap on the <strong>OK<\/strong> button.<\/p>\n<p>Thus, in this way, you can archive emails separately and fix the Outlook OST file size issue.<\/p>\n<h3>When are manual solutions not enough for you?<\/h3>\n<p><!--StartFragment --><\/p>\n<p class=\"pf0\"><span class=\"cf0\">We agree that these solutions might help you get back to the previous situation easily. But on the other side, it&#8217;s also true that these fixes are not workable in some circumstances. Such as;<\/span><\/p>\n<ul>\n<li class=\"pf0\"><span class=\"cf0\">If the OST file is already too large to access or open.<\/span><\/li>\n<li class=\"pf0\"><span class=\"cf0\">Outlook won&#8217;t open at all.<\/span><\/li>\n<li class=\"pf0\"><span class=\"cf0\">There is an issue in the OST file that is not easily possible without repairing.<\/span><\/li>\n<\/ul>\n<p class=\"pf0\"><span class=\"cf0\">At this point, manual methods are of no use. So, you need a safer option. You might be wondering what it can be? We have an alternate solution for you that you can use to try when these manual fixes won&#8217;t work. Let&#8217;s see how!<\/span><\/p>\n<div class=\"blue-border\">\n<h3>What to Do If the OST File Is Still Too Large?<\/h3>\n<p>You have understood that manual methods are not useful; using an automated solution is suggested. Here, you can use a third-party tool like <strong>Advik software<\/strong> to easily <a href=\"https:\/\/www.adviksoft.com\/ost\/pst.html\">convert OST to PST<\/a> to <a href=\"https:\/\/www.adviksoft.com\/blog\/errors-detected-in-ost-file-issue\/\">fix errors detected in OST file<\/a>. It can help you to reduce OST file size, manage multiple mailboxes, and solve any issues. The complete procedure is simple and straightforward. You can go through the link mentioned below to know more.<\/p>\n<p><a href=\"https:\/\/www.adviksoft.com\/ost\/converter.html\">https:\/\/www.adviksoft.com\/ost\/converter.html<\/a>\n<\/div>\n<h4>Final Words<\/h4>\n<p class=\"pf0\"><span class=\"cf0\">Dealing with Microsoft Outlook OST file too big issue can be a real challenge, if it contains your important data. But, no worries, this blog is a complete how-to guide to understand the whole issue with the right methods to use. We have discussed every solution in more detail, so you can easily Outlook OST file very large issue.<\/span><\/p>\n<p class=\"pf0\"><span class=\"cf0\">Just go through this blog completely and choose the method as per your needs. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Are you unsure about how to handle the Outlook OST file too big issue? Well, fear not! In this guide, we will help you resolve errors related to OST files being too large. Here, we are going to explain multiple solutions that you can use to fix your query easily. So, stay tuned to understand [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":43709,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2323],"tags":[],"class_list":["post-43679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook-errors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix Microsoft Outlook OST File Too Big Issue?<\/title>\n<meta name=\"description\" content=\"Are you facing issues dealing with a Microsoft Outlook OST file too big? 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Click here to get the most appropriate ways to fix the Outlook OST file too large issue.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.adviksoft.com\/blog\/microsoft-outlook-ost-file-too-big\/\" \/>\n<meta property=\"og:site_name\" content=\"Advik Software Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/AdvikSoftware\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-30T10:14:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-30T10:15:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2025\/12\/Advik-Featured-Image-1-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Jackson Strong\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jackson Strong\" \/>\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.adviksoft.com\\\/blog\\\/microsoft-outlook-ost-file-too-big\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/microsoft-outlook-ost-file-too-big\\\/\"},\"author\":{\"name\":\"Jackson Strong\",\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/#\\\/schema\\\/person\\\/2eb0db45ed6f2abfeb3d2f1f5692d45d\"},\"headline\":\"Microsoft Outlook OST File Too Big? 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