{"id":4096,"date":"2017-06-27T11:15:28","date_gmt":"2017-06-27T11:15:28","guid":{"rendered":"https:\/\/sysinfotools.com\/blog\/?p=4096"},"modified":"2026-07-25T09:43:53","modified_gmt":"2026-07-25T09:43:53","slug":"increase-outlook-mailbox-size","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/increase-outlook-mailbox-size\/","title":{"rendered":"How to Increase Outlook Mailbox Size in Outlook 2019, 2016?"},"content":{"rendered":"<div class=\"block_sum\">\n<p><strong>Summary:-<\/strong> If you\u2019ve been using Outlook for a while, you must know that the PST file has size limits. Older versions, like Outlook 2002, can only hold 2 GB, while Outlook 2003 and later versions offer between 20-50 GB. However, this may not feel enough when you\u2019re handling thousands of email messages daily. Consequently, this becomes challenging for users. Here is a detailed blog about how to increase Outlook mailbox size and get enough storage space. Also, note that the oversized PST can lead to severe corruption. Use <a href=\"https:\/\/www.sysinfotools.com\/recovery\/pst-recovery.php\"><strong>PST File Recovery<\/strong><\/a> to recover all important data.<\/p>\n<p class=\"blog-btn\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-PST-recovery.exe\"><i class=\"icon-windows\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/pst-recovery.php\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/p>\n<\/div>\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\/increase-outlook-mailbox-size\/#What_are_the_Types_of_PST_Files\" >What are the Types of PST 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.sysinfotools.com\/blog\/increase-outlook-mailbox-size\/#Reasons_of_Outlook_Mailbox_Corruption\" >Reasons of Outlook Mailbox Corruption<\/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.sysinfotools.com\/blog\/increase-outlook-mailbox-size\/#How_to_Increase_Outlook_Mailbox_Size_Limit\" >How to Increase Outlook Mailbox Size Limit?<\/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.sysinfotools.com\/blog\/increase-outlook-mailbox-size\/#Open_Registry_Editor\" >Open Registry Editor<\/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.sysinfotools.com\/blog\/increase-outlook-mailbox-size\/#Now_modify_PST_mailbox_size\" >Now modify PST mailbox size<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_the_Types_of_PST_Files\"><\/span>What are the Types of PST Files?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Microsoft Outlook client creates Outlook data file, called <strong>PST<\/strong> or <em>personal storage table<\/em>, on a local computer system. It saves the PST files in two different formats: <strong><a href=\"https:\/\/www.sysinfotools.com\/blog\/easy-trick-convert-ansi-pst-unicode\/\">ANSI and Unicode<\/a><\/strong>. In Outlook 2002 and earlier versions, PST files are saved in ANSI format. In Outlook 2003 and later versions including the latest 2016, PST files are saved in Unicode format. Size limitation is the only difference between these two formats. An ANSI PST file can only store up to 2 GB of mailbox content. On the other hand, a Unicode PST file can store 20 to 50 GB mailbox content. In Outlook 2003, 2007 &amp; 2010,\u00a0the maximum size limitation is 20 GB. And in Outlook 2013 &amp; 2016, the maximum size limitation is 50 GB. Now it&#8217;s clear that\u00a0Unicode PST file provides you more storage space than ANSI PST.<\/p>\n<p>These days, most Outlook users are using the latest versions. It means most of the Outlook users are using Unicode PST file format. Though it provides you with enough storage space,\u00a0sometimes you may face size limitation issues. If the size of the <a href=\"https:\/\/www.sysinfotools.com\/blog\/the-outlook-data-file-has-reached-the-maximum-size\/\">PST file grows and reaches its maximum size<\/a>, it may cause some serious problems for Outlook users. You&#8217;ll notice that the Outlook client starts hanging or crashing frequently. Sometimes you can face even\u00a0the worst situation which is corruption. An oversized PST file\u00a0is always prone to corruption. Being oversized means the PST file has reached or exceeded its maximum size limitation.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Reasons_of_Outlook_Mailbox_Corruption\"><\/span>Reasons of Outlook Mailbox Corruption<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Corruption is not less than a\u00a0nightmare for Outlook users. It can cause\u00a0permanent data loss situations. In the case of minor corruption, you can use the <a href=\"https:\/\/www.sysinfotools.com\/blog\/scanpst-location-outlook-windows\/\">scanpst.exe utility to repair the PST file<\/a>. But if corruption is severe, the Inbox Repair tool can&#8217;t help you. You have to use a professional recovery tool that&#8217;ll cost you a lot of money. How about this if I show you an easy manual trick to increase Outlook mailbox size? By using that trick, you can easily increase PST file size without causing any alteration or damage.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Increase_Outlook_Mailbox_Size_Limit\"><\/span>How to Increase Outlook Mailbox Size Limit?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>I&#8217;ve heard this question thousand times so far. Most Outlook users stuck with PST file size limitation issues. They want to increase Outlook mailbox size limit so that they can store more mailbox content. If you&#8217;re using Outlook 2003, Outlook 2007, Outlook 2010, Outlook 2010 or Outlook 2016, you should definitely try the manual trick I&#8217;m sharing below. You should use <strong>Windows Registry Editor<\/strong>. There you can define the PST file size limit as per the Outlook version you&#8217;re using. Just follow these simple steps:<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Open_Registry_Editor\"><\/span>Open Registry Editor<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Step 1:<\/strong> Press <strong>Win + R<\/strong> on your desktop screen. Now\u00a0enter <em>\u201cregedit\u201d<\/em> in the search box and click <strong>Enter<\/strong>.<img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/run-regedit.exe_.png\" alt=\"run regedit.exe on your system\" \/><\/p>\n<p>This will take you to the <strong>Registry Editor<\/strong>.<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Now_modify_PST_mailbox_size\"><\/span>Now modify PST mailbox size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Step 2:<\/strong> You\u2019ll see a tree structure under Computer on Registry Editor window. In the list, you\u2019ll see <strong><em>HKEY_CURRENT_USER<\/em><\/strong> entry.<br \/>\n<img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor.png\" alt=\"how to use registry editor\" \/><\/p>\n<p>Expand it by clicking it once.<\/p>\n<p><strong>Step 3:<\/strong>\u00a0Now you need to navigate to the following registry path according to your Outlook version.<\/p>\n<h4><strong>For single users<\/strong><\/h4>\n<ul>\n<li>For <strong>Outlook 2003<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\11.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2007<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\12.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2010<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2013<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\15.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2016<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<\/ul>\n<h4><strong>For administrators<\/strong><\/h4>\n<ul>\n<li>For <strong>Outlook 2003<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Policies\\Microsoft\\Office\\11.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2007<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Policies\\Microsoft\\Office\\12.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2010<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Policies\\Microsoft\\Office\\14.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2013<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Policies\\Microsoft\\Office\\15.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<li>For <strong>Outlook 2016<\/strong> users, navigate to\n<pre><em>HKEY_CURRENT_USER\\Software\\Policies\\Microsoft\\Office\\16.0\\Outlook\\PST<\/em><\/pre>\n<\/li>\n<\/ul>\n<p><strong>Step 4:<\/strong>\u00a0Once you&#8217;ve reached to the entry <strong>PST<\/strong> in the tree-structure, you&#8217;ll see something this:<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor-2.png\" alt=\"how to use registry editor\" \/><\/figure>\n<p><strong>Step 5:<\/strong>\u00a0If you can&#8217;t see the following two values there, you have to create them manually:<\/p>\n<ul>\n<li><strong>MaxLargeFileSize<\/strong><\/li>\n<li><strong>WarnLargeFileSize<\/strong><\/li>\n<\/ul>\n<p><strong>Step 6:<\/strong>\u00a0Just right-click on the blank space. Point to <strong>New<\/strong> <strong>&gt;<\/strong> <strong>DWORD (32-bit) Value<\/strong>.<img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor-3.png\" alt=\"how to use registry editor\" \/><\/p>\n<p><strong>Note:<\/strong> If you&#8217;re using Outlook 64-bit version, you should choose <strong>QWORD (64-bit) Value<\/strong>.<\/p>\n<p><strong>Step 7:<\/strong>\u00a0Give this entry a name: <em><strong>MaxLargeFileSize<\/strong><\/em>.<img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor-4.png\" alt=\"how to use registry editor\" \/><\/p>\n<p><strong>Step 8:<\/strong>\u00a0Again, right-click\u00a0on the blank space. Point to <strong>New<\/strong> <strong>&gt;<\/strong> <strong>DWORD (32-bit) Value<\/strong><img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor-5.png\" alt=\"how to use registry editor\" \/><\/p>\n<p><strong>Step 9:<\/strong> Give\u00a0this entry a name: <em><strong>Warn<\/strong><strong>LargeFileSize<\/strong><\/em>.<img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor-6.png\" alt=\"how to use registry editor\" \/><\/p>\n<p>Once you&#8217;ve created these two values, you have to define their values. How will you do that?<\/p>\n<p><strong>Step 10:<\/strong>\u00a0First double-click <em><strong>MaxLargeFileSize<\/strong><\/em>.<img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor-7.png\" alt=\"how to use registry editor\" \/><\/p>\n<p>Now enter the <strong>Value data<\/strong> and define the <strong>Base<\/strong> type:<\/p>\n<ul>\n<li>Define the value data in MB. Make sure it should be more than the maximum size of your PST file. Since I&#8217;m using Outlook 2010 and I want 50 GB PST file size, I&#8217;ll enter <strong>51200<\/strong>, i.e. 50 GB=51200 MB.<\/li>\n<li>Choose <strong>Decimal<\/strong>\u00a0as the base type, and click <strong>OK<\/strong>\u00a0to save it.<\/li>\n<\/ul>\n<p><strong>Step 11:<\/strong>\u00a0Now double-click <em><strong>WarnLargeFileSize<\/strong><\/em>.<img decoding=\"async\" src=\"https:\/\/sysinfotools.com\/blog\/wp-content\/uploads\/2017\/06\/registry-editor-8.png\" alt=\"how to use registry editor\" \/><\/p>\n<p>Now again enter the <strong>Value data<\/strong> and define the <strong>Base<\/strong> type:<\/p>\n<ul>\n<li>This time enter a value which must be at least 95% of the MaxLargeFileSize value. For e.g.\u00a051200 x 95%= <strong>48640<\/strong>.<\/li>\n<li>Choose Decimal as the base type, and click <strong>OK<\/strong> to save it.<\/li>\n<\/ul>\n<p><strong>Step 12:<\/strong>\u00a0Now close the <strong>Registry Editor<\/strong>.<\/p>\n<p>The task of &#8220;increase Outlook mailbox size&#8221; has been successfully completed.<\/p>\n<p>Read More: Solve error: <a href=\"https:\/\/www.sysinfotools.com\/blog\/microsoft-outlook-encountered-a-problem-and-needs-to-close\/\"><strong>Microsoft Outlook Encountered A Problem And Needs To Close<\/strong><\/a>.<\/p>\n\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;4096&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;1&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 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;How to Increase Outlook Mailbox Size in Outlook 2019, 2016?&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 - (1 vote)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary:- If you\u2019ve been using Outlook for a while, you must know that the PST file has size limits. Older<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/increase-outlook-mailbox-size\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":4829,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[528],"tags":[712,1048,807,482,1044,1049,1046,512,1047,1045],"class_list":["post-4096","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mail-management","tag-ansi-pst","tag-increase-outlook-mailbox-size","tag-increase-pst-file-size","tag-microsoft-outlook-2","tag-outlook-client","tag-pst-file-size-limitation","tag-registry-editor","tag-repair-pst-file","tag-scanpst-exe","tag-unicode-pst-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 Increase Outlook Mailbox Size in Latest Version 2019, 2016<\/title>\n<meta name=\"description\" content=\"Running out of mailbox space in Outlook 2019\/2016? 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