{"id":7477,"date":"2026-04-07T09:14:16","date_gmt":"2026-04-07T07:14:16","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=7477"},"modified":"2026-04-07T09:14:17","modified_gmt":"2026-04-07T07:14:17","slug":"troubleshooting-outlook-error-0x800c0133","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/en\/knowledgebase\/troubleshooting-outlook-error-0x800c0133\/","title":{"rendered":"Troubleshooting Outlook Error 0x800C0133"},"content":{"rendered":"\n<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">Error <strong>0x800C0133<\/strong> is a data storage notification. It occurs when your email client (such as Microsoft Outlook, Outlook Express, or Windows Live Mail) is unable to write newly downloaded messages to your computer&#8217;s hard drive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In most cases, this is not a server-side issue with <strong>mybox<\/strong>, but rather a local problem where the database file storing your emails has reached a size limit or become corrupted.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom 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\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/troubleshooting-outlook-error-0x800c0133\/#Common_Causes\" >Common Causes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/troubleshooting-outlook-error-0x800c0133\/#How_to_Resolve\" >How to Resolve<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/troubleshooting-outlook-error-0x800c0133\/#Distinction_Block\" >Distinction Block<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/troubleshooting-outlook-error-0x800c0133\/#Practical_Implications\" >Practical Implications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/troubleshooting-outlook-error-0x800c0133\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Causes\"><\/span>Common Causes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>File Size Limit:<\/strong> Older versions of Outlook and Outlook Express have strict limits on how large a mailbox file (PST or DBX) can be. Once this limit is reached, the application can no longer &#8220;fit&#8221; new mail into the file.<\/li>\n\n\n\n<li><strong>File Corruption:<\/strong> If Outlook is closed improperly (e.g., during a power outage or system crash), the internal structure of the email database can become damaged.<\/li>\n\n\n\n<li><strong>Disk Permissions:<\/strong> Your operating system may be preventing Outlook from writing to the folder where your mail is stored, often due to restrictive security settings or a full hard drive.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Resolve\"><\/span>How to Resolve<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<\/div>\n\n<div id=\"mybox-1375785040\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Early access<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Still need help?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contact our customer service team.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Message us<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">To fix error 0x800C0133, you must address the health of your local mail database:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Repair the Outlook Data File<\/strong> Microsoft provides a built-in tool called <strong>ScanPST.exe<\/strong> (the Inbox Repair Tool) specifically for this error.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Locate <strong>ScanPST.exe<\/strong> on your computer (typically found in the Outlook installation folder).<\/li>\n\n\n\n<li>Select your data file (ending in <code>.pst<\/code> or <code>.ost<\/code>).<\/li>\n\n\n\n<li>Run the repair process to fix any internal inconsistencies.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Compact or Reduce Mailbox Size<\/strong> If your file is approaching 2GB (for older versions) or 50GB (for modern versions), you should move older messages to an archive.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In Outlook, go to <strong>File<\/strong> > <strong>Info<\/strong> > <strong>Cleanup Tools<\/strong> > <strong>Mailbox Cleanup<\/strong>.<\/li>\n\n\n\n<li>Select <strong>View Mailbox Size<\/strong> to see which folders are taking up the most space.<\/li>\n\n\n\n<li>Use the <strong>Archive<\/strong> feature to move old correspondence to a separate local file.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Check Disk Space and Permissions<\/strong> Ensure your computer has at least a few gigabytes of free space. If your drive is nearly full, Outlook will be unable to cache new messages from <strong>imap.mybox.com<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Distinction_Block\"><\/span>Distinction Block<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Local Storage vs. Server Storage<\/strong> Error 0x800C0133 is a <strong>local storage<\/strong> error on your computer. Even if your <strong>mybox<\/strong> account has plenty of space available at <strong>mail.mybox.com<\/strong>, Outlook will still fail if it cannot save its local copy to your hard drive.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Practical_Implications\"><\/span>Practical Implications<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Data Safety:<\/strong> Always create a backup of your <code>.pst<\/code> file before running repair tools or deleting large amounts of data.<\/li>\n\n\n\n<li><strong>IMAP Benefits:<\/strong> If you use <strong>IMAP<\/strong> (the recommended protocol for <strong>mybox<\/strong>), your messages are safely stored on our servers. If your local Outlook file is beyond repair, you can simply create a new profile in Outlook, and it will re-download your messages from the server.<\/li>\n\n\n\n<li><strong>Software Updates:<\/strong> If you are using an extremely old version of Outlook Express, consider upgrading to a modern client, as older formats are significantly more prone to this type of corruption.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Error 0x800C0133 indicates that your local email &#8220;container&#8221; is full or broken. By repairing your data file and managing your local storage, you ensure that Outlook can continue to sync smoothly with the <strong>mybox<\/strong> infrastructure.<\/p>\n<\/div>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[41,44,45],"manual_kb_tag":[],"class_list":["post-7477","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-email","manualknowledgebasecat-errors-receiving-messages","manualknowledgebasecat-errors-sending-messages"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/7477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":1,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/7477\/revisions"}],"predecessor-version":[{"id":7478,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/7477\/revisions\/7478"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/media?parent=7477"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manualknowledgebasecat?post=7477"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb_tag?post=7477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}