{"id":6629,"date":"2025-07-23T13:09:53","date_gmt":"2025-07-23T13:09:53","guid":{"rendered":"https:\/\/www.macsonik.com\/blog\/?p=6629"},"modified":"2026-08-10T10:04:51","modified_gmt":"2026-08-10T10:04:51","slug":"outlook-archive-not-reducing-mailbox-size","status":"publish","type":"post","link":"https:\/\/www.macsonik.com\/blog\/outlook-archive-not-reducing-mailbox-size\/","title":{"rendered":"Resolve Error Outlook Archive not Reducing Mailbox Size"},"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;6629&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;Resolve Error Outlook Archive not Reducing Mailbox Size&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> An archive folder is mostly used to keep important emails for future reference. This will consume space in the mailbox. If there are multiple emails stored in the archive and the mailbox gets overloaded, an issue arises: \u201cOutlook archive not reducing mailbox size. It becomes difficult for users to fix this issue without any risk or data loss. You don&#8217;t need to worry anymore. We are here to help you resolve this issue within a few seconds.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Firstly, learn about the reasons why the Outlook mailbox size is not reduced, even after archiving it. Further, you will be introduced to the advanced <a href=\"https:\/\/www.macsonik.com\/pst-splitter\/\"  target=\"_blank\" ><strong>PST Splitter Tool<\/strong><\/a> and various manual approaches. To pick the best method to resolve this issue, you have to go through this blog thoroughly.&nbsp;&nbsp;<\/p>\n<div class=\"ms_btn_sec text-center my-3\"><a href=\"https:\/\/www.macsonik.com\/dl\/Macsonik-PST-Splitter.dmg\"\" class=\"btn btn-download mr-3\"><i class=\"icon-download-1\"><\/i> Download Now<\/a><a href=\"https:\/\/www.macsonik.com\/pst-splitter\/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_85 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\/outlook-archive-not-reducing-mailbox-size\/#Why_is_Outlook_Mailbox_Size_Not_Reducing_after_Archive\" >Why is Outlook Mailbox Size Not Reducing after Archive?<\/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\/outlook-archive-not-reducing-mailbox-size\/#Resolve_%E2%80%9COutlook_Archive_not_Reducing_Mailbox_Size%E2%80%9D_Issue\" >Resolve \u201cOutlook Archive not Reducing Mailbox Size\u201d Issue<\/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\/outlook-archive-not-reducing-mailbox-size\/#Tech_1_Restart_Your_Microsoft_Outlook\" >Tech 1. Restart Your Microsoft Outlook<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.macsonik.com\/blog\/outlook-archive-not-reducing-mailbox-size\/#Tech_2_Compact_Microsoft_Outlook_Data_File\" >Tech 2. Compact Microsoft Outlook Data File&nbsp;<\/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.macsonik.com\/blog\/outlook-archive-not-reducing-mailbox-size\/#Tech_3_Search_Large_Size_Attachments_Manually\" >Tech 3. Search Large Size Attachments Manually&nbsp;<\/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.macsonik.com\/blog\/outlook-archive-not-reducing-mailbox-size\/#Method_4_Expert_Recommended_Solution_to_Fix_Outlook_Archive_Does_Not_Reduce_Mailbox_Size\" >Method 4. Expert Recommended Solution to Fix: Outlook Archive Does Not Reduce Mailbox Size<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.macsonik.com\/blog\/outlook-archive-not-reducing-mailbox-size\/#Simple_Steps_to_Outlook_Mailbox_Full_After_Archiving\" >Simple Steps to Outlook Mailbox Full After Archiving<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.macsonik.com\/blog\/outlook-archive-not-reducing-mailbox-size\/#Conclusion\" >Conclusion&nbsp;<\/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\/outlook-archive-not-reducing-mailbox-size\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_is_Outlook_Mailbox_Size_Not_Reducing_after_Archive\"><\/span>Why is Outlook Mailbox Size Not Reducing after Archive?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You might have archived your emails in Outlook to shrink your mailbox size. But the size hasn\u2019t reduced due to the following reasons:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When you archive, only old emails are moved, while new emails remain in your Outlook mailbox.<\/li>\n\n\n\n<li>You may have missed selecting certain folders, especially those containing large files, during the archiving process.<\/li>\n\n\n\n<li>Even if you\u2019ve deleted emails, the Deleted Items folder still counts toward your mailbox size until it\u2019s emptied.<\/li>\n\n\n\n<li>Your OST or PST file won\u2019t reduce in size automatically\u2014you need to manually compact it to reclaim space.<\/li>\n\n\n\n<li>If AutoArchive is not enabled, archiving won&#8217;t occur unless you run it manually.<\/li>\n\n\n\n<li>Outlook may take time to reflect changes, as mailbox size updates can be delayed.<\/li>\n\n\n\n<li>A corrupted or damaged Outlook profile can interfere with the archiving process or prevent accurate display of mailbox size.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Apart from this, there are various other reasons that lead to this issue. If you want to fix it, read this blog further.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Resolve_%E2%80%9COutlook_Archive_not_Reducing_Mailbox_Size%E2%80%9D_Issue\"><\/span>Resolve \u201cOutlook Archive not Reducing Mailbox Size\u201d Issue<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You can use different methods to resolve this issue. Some of the effective ways are listed below, along with the detailed steps. So, read all of them and choose the solution that fits best.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tech_1_Restart_Your_Microsoft_Outlook\"><\/span>Tech 1. Restart Your Microsoft Outlook<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes, caching makes it difficult to display the mailbox size updates. If you refresh and restart your Outlook application, the mailbox size might show accurately. Here are the steps to do this:&nbsp;&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>First, close all tabs, including MS Outlook.\u00a0<\/li>\n\n\n\n<li>Then, restart Outlook and move to <strong>Files<\/strong> and tap <strong>Tools<\/strong>.\u00a0<\/li>\n\n\n\n<li>In the Tools, hit <strong>Mailbox Cleanup<\/strong>.<\/li>\n\n\n\n<li>After that, click <strong>View Mailbox Size<\/strong>.\u00a0<\/li>\n\n\n\n<li>Now, you can check all the details.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tech_2_Compact_Microsoft_Outlook_Data_File\"><\/span>Tech 2. Compact Microsoft Outlook Data File&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you archive or delete the emails or items, your mailbox size might be reduced. To do this, you need to compact the files manually. For this, follow the given steps:&nbsp;&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>To start, visit the <strong>File<\/strong> and tap <strong>Account Settings<\/strong> in the Outlook application.\u00a0<\/li>\n\n\n\n<li>Further, move to <strong>Account Settings<\/strong> and pick <strong>Outlook PST or OST data file<\/strong> under <strong>Data Files<\/strong>.<\/li>\n\n\n\n<li>Next, hit <strong>Open File Location<\/strong> and close the Outlook tab.\u00a0<\/li>\n\n\n\n<li>Thereafter, <strong>right-click on the PST or OST<\/strong> <strong>file<\/strong> in the <strong>File Explorer<\/strong> -> <strong>Properties<\/strong>.<\/li>\n\n\n\n<li>At last, press the <strong>Advanced<\/strong> button -> click <strong>Compact Now<\/strong> to initiate the process.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tech_3_Search_Large_Size_Attachments_Manually\"><\/span>Tech 3. Search Large Size Attachments Manually&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">After archiving the emails, the mailbox is still full then it might be due to large-sized attachments. To deal with this, it is necessary to review and delete large attachments manually to free mailbox space. To complete it, read and follow the mentioned steps.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>In Outlook, choose the folder to review.\u00a0<\/li>\n\n\n\n<li>Later, navigate to <strong>View<\/strong> -> <strong>Arrange By<\/strong>\u00a0 and then <strong>Size<\/strong>.<\/li>\n\n\n\n<li>Then, look for large emails with attachments.\u00a0<\/li>\n\n\n\n<li>After that, right-tap on the attachment -> <strong>Save As<\/strong>.\u00a0<\/li>\n\n\n\n<li>Next, save the attachments locally.\u00a0<\/li>\n\n\n\n<li>Afterwards, remove the emails without or along with attachments.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_4_Expert_Recommended_Solution_to_Fix_Outlook_Archive_Does_Not_Reduce_Mailbox_Size\"><\/span>Method 4. Expert Recommended Solution to Fix: Outlook Archive Does Not Reduce Mailbox Size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>MacSonik PST Splitter Tool<\/strong> is a reliable utility to help in reducing the PST file size automatically. This wizard allows users to divide the PST file into smaller PST files, which makes it easier to keep and archive bulk data. Apart from this, it helps in resolving the Outlook archive not reducing mailbox size issues. Additionally, it is convenient for users with no technical expertise to split the large PST files instantly. In addition, it is known for completing with zero error and risk while maintaining the folder hierarchy throughout the process.&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Simple_Steps_to_Outlook_Mailbox_Full_After_Archiving\"><\/span>Simple Steps to Outlook Mailbox Full After Archiving<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Using the given instruction will help you reduce the PST file size by breaking it down.&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>First, download and run the <strong>PST Splitter Software<\/strong> on your system.\u00a0<\/li>\n\n\n\n<li>After that, tap <strong>Add File<\/strong> to browse and choose PST files to split. Hit <strong>Open<\/strong> and <strong>Next<\/strong>.\u00a0<\/li>\n\n\n\n<li>Further, select the files and set the criteria to split the files accordingly.\u00a0<\/li>\n\n\n\n<li>Then, hit <strong>Next<\/strong> and select the split options.<\/li>\n\n\n\n<li>Next, assign the path to save it in your system.\u00a0<\/li>\n\n\n\n<li>Lastly, click the <strong>Split<\/strong> to initiate the splitting process.\u00a0<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Here, this blog provides all the necessary information that might be needed to fix Outlook archive not reducing mailbox size issues. It includes the different situations that let the issue occur and manual techniques to fix it. Other than this, an automated software for splitting multiple PST files at once. Additionally, the split PST files will be easier to archive. As a result, the mailbox size will be reduced automatically.&nbsp;<\/p>\n\n\n\n<h4 class=\"faq_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1753275573081\"><strong class=\"schema-faq-question\"><br\/>Q1. How to reduce PST file size after archiving?<br\/><\/strong> <p class=\"schema-faq-answer\">To reduce the PST file size, you can use a professional technique.\u00a0<br\/><br\/>1. Install and open the MacSonik PST Splitter Tool.\u00a0<br\/>2. Add the PST files to be split into smaller ones.<br\/>3. Set the criteria for dividing PST files.\u00a0<br\/>4. Create a path to keep the split PST files.\u00a0<br\/>5. Click Split to begin this process.\u00a0<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: An archive folder is mostly used to keep important emails for future reference. This will consume space in the<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.macsonik.com\/blog\/outlook-archive-not-reducing-mailbox-size\/\">Read More<\/a><\/p>\n","protected":false},"author":10,"featured_media":6630,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,439],"tags":[],"class_list":["post-6629","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gmail-backup","category-pst-splitter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Resolve Error Outlook Archive not Reducing Mailbox Size<\/title>\n<meta name=\"description\" content=\"Is your Outlook archive not reducing mailbox size? 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