{"id":2784,"date":"2025-08-04T12:52:19","date_gmt":"2025-08-04T12:52:19","guid":{"rendered":"https:\/\/www.arysontechnologies.com\/how-to\/?p=2784"},"modified":"2025-08-04T12:57:45","modified_gmt":"2025-08-04T12:57:45","slug":"increase-microsoft-365-mailbox-size","status":"publish","type":"post","link":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/","title":{"rendered":"Increase Mailbox Size in Microsoft 365 Exchange Online &#8211; A Complete Guides"},"content":{"rendered":"<div class=\"block_sum mb-3\">\n<p><em>If you are running out of mailbox space in Microsoft 365, it can feel like hitting a wall. One moment, you are working just fine. And the next, you cannot send or receive emails because your mailbox is full. Hence, it becomes quite irritating and avoidable. The truth is, Microsoft 365 Exchange Online comes with different mailbox size limits depending on your plan.<\/em><\/p>\n<p><em>But here is the good part: there are built-in ways to increase your mailbox size without deleting anything. Along with that, use the <a href=\"https:\/\/www.arysontechnologies.com\/office365-backup\/\" target=\"_blank\" rel=\"noopener\"><strong>Aryson Office Backup &amp; Restore Tool<\/strong><\/a> to increase mailbox size in Microsoft 365 Exchange Online. In this guide, we will walk you through all the best options to boost your mailbox capacity. Further, we will explain each solution, so you can easily choose what works according to your needs.<\/em><\/p>\n<div class=\"row justify-content-center mac-win-tab\">\n<div class=\"col-md-6\">\n<ul id=\"myTab\" class=\"nav nav-tabs justify-content-center border-primary\" role=\"tablist\">\n<li class=\"nav-item\" role=\"presentation\"><button id=\"home-tab\" class=\"nav-link bg-transparent px-4 active\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#home\" aria-controls=\"home\" aria-selected=\"true\"><i class=\"icon-windows\"><\/i> Windows<\/button><\/li>\n<li class=\"nav-item\" role=\"presentation\"><button id=\"profile-tab\" class=\"nav-link bg-transparent px-4\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#profile\" aria-controls=\"profile\" aria-selected=\"false\"><i class=\"icon-apple\"><\/i>Mac<\/button><\/li>\n<\/ul>\n<div id=\"myTabContent\" class=\"tab-content\">\n<div id=\"home\" class=\"tab-pane fade active show\" role=\"tabpanel\" aria-labelledby=\"home-tab\"><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/Aryson-Office365-backup.exe\" rel=\"nofollow\"><i class=\"icon-windows\"><\/i> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/office365-backup\/buy-now.php\" rel=\"nofollow\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/div>\n<div id=\"profile\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"profile-tab\"><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.arysontechnologies.com\/demo-version\/Aryson-Mac-Office365-backup.dmg\" rel=\"nofollow\"><i class=\"icon-apple\"><\/i> Download Now<\/a>\u00a0\u00a0<a class=\"custom-buy-btn\" href=\"https:\/\/www.arysontechnologies.com\/mac\/backup-office365\/buy-now.php\" rel=\"nofollow\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 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 ez-toc-toggle\" style=\"cursor:pointer\">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: #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 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Reasons_for_Increasing_Mailbox_Size_in_Microsoft_365\" >Reasons for Increasing Mailbox Size in Microsoft 365<\/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.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Default_Mailbox_Size_Limits_in_Microsoft_365_Plans\" >Default Mailbox Size Limits in Microsoft 365 Plans<\/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.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#How_to_Monitor_Your_Mailbox_Size_in_Microsoft_365_Outlook\" >How to Monitor Your Mailbox Size in Microsoft 365 Outlook\u00a0<\/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.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Now_View_Your_Existing_Office_365_Mailbox_Usage\" >Now, View Your Existing Office 365 Mailbox Usage<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Simple_Ways_to_Increase_Mailbox_Size_in_Microsoft_365_Exchange_Online\" >Simple Ways to Increase Mailbox Size in Microsoft 365 Exchange Online<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Method_01_Upgrade_to_a_Higher_Microsoft_365_Plan\" >Method 01: Upgrade to a Higher Microsoft 365 Plan<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Method_02_Enable_Archive_Mailbox\" >Method 02: Enable Archive Mailbox<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Method_03_Increase_Office_365_Mailbox_Size_via_PowerShell\" >Method 03: Increase Office 365 Mailbox Size via PowerShell<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Steps_to_Fix_Exchange_Online_archive_mailbox_size_Using_PowerShell\" >Steps to Fix Exchange Online archive mailbox size Using PowerShell<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Method_04_Backup_and_Free_Up_Server_Space_of_your_Exchange_Online_Archive_Mailbox\" >Method 04: Backup and Free Up Server Space of your Exchange Online Archive Mailbox<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Follow_these_Steps_to_Free_Up_Server_Space_and_Increase_Mailbox_Size\" >Follow these Steps to Free Up Server Space and Increase Mailbox Size\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Conclusion\" >Conclusion<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#Frequently_Asked_Questions_FAQs\" >Frequently Asked Questions (FAQs)<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Reasons_for_Increasing_Mailbox_Size_in_Microsoft_365\"><\/span>Reasons for Increasing Mailbox Size in Microsoft 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Email is still one of the main ways people and businesses stay in touch. But when your mailbox starts getting full, things can quickly go wrong. If you are using Microsoft 365 and reach the storage limit, it can stop your email from working correctly. That\u2019s why it is important to know why increasing your mailbox size is not just useful. It is sometimes the only way to keep everything running smoothly.<\/p>\n<ul>\n<li>If you get a lot of emails every day, like updates, replies, and alerts, your inbox can fill up quickly. It is even more common in busy roles like sales, customer service, or project work.<\/li>\n<li>Emails that include PDFs, spreadsheets, presentations, or images take up far more space than plain text. The more of these you receive, the faster your mailbox fills up.<\/li>\n<li>Some users prefer to keep a complete email history when it involves contracts, client conversations, or sensitive communications. Deleting isn&#8217;t always a safe option.<\/li>\n<li>Microsoft allows archiving, but if you have been storing emails for years, even your archive mailbox may start to run low on space if auto-expanding isn&#8217;t turned on.<\/li>\n<li>A full mailbox can cause sync delays or even failures in Outlook. Hence, it becomes hard to access or send emails from the desktop app.<\/li>\n<\/ul>\n<p>All of these are clear signs it&#8217;s time to increase your mailbox size. Doing it early helps avoid issues and keeps your email running smoothly.<\/p>\n<p><strong>Now, let&#8217;s talk about what can go wrong if your mailbox hits its limit:<\/strong><\/p>\n<ul>\n<li>You won&#8217;t be able to send or receive any new emails, which can instantly interrupt your workflow.<\/li>\n<li>Along with that, you could miss out on important messages without even knowing it.<\/li>\n<li>The Outlook desktop app may stop syncing properly.<\/li>\n<li>And if you are forced to delete emails in a hurry just to free up server space, you could accidentally lose something important.<\/li>\n<\/ul>\n<p>That&#8217;s why managing your mailbox size before it becomes a problem is so important. It keeps your work running smoothly without interruptions or storage worries.<\/p>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Default_Mailbox_Size_Limits_in_Microsoft_365_Plans\"><\/span>Default Mailbox Size Limits in Microsoft 365 Plans<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Microsoft 365 offers different mailbox size limits depending on the <a href=\"https:\/\/www.arysontechnologies.com\/blog\/compare-microsoft-office-365-plans-and-features\/\"><strong>O365 subscription plan<\/strong><\/a> you&#8217;re using. These limits are set by default. It can impact how many emails you can store before you run into space issues.<\/p>\n<table style=\"background-color: #f2f2f2;\" border=\"2\">\n<tbody>\n<tr>\n<td>\n<p><strong>Plan Name<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Primary Mailbox Size<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Archive Mailbox<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Auto-Expanding Archive Support<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Business Basic<\/p>\n<\/td>\n<td>\n<p>50 GB<\/p>\n<\/td>\n<td>\n<p>Not included by default<\/p>\n<\/td>\n<td>\n<p>No<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Business Standard<\/p>\n<\/td>\n<td>\n<p>50 GB<\/p>\n<\/td>\n<td>\n<p>Not included by default<\/p>\n<\/td>\n<td>\n<p>No<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Business Premium<\/p>\n<\/td>\n<td>\n<p>50 GB<\/p>\n<\/td>\n<td>\n<p>Available if enabled<\/p>\n<\/td>\n<td>\n<p>Yes<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Microsoft 365 E1<\/p>\n<\/td>\n<td>\n<p>50 GB<\/p>\n<\/td>\n<td>\n<p>Up to 1.5 TB with auto-expansion<\/p>\n<\/td>\n<td>\n<p>Yes<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Microsoft 365 E3<\/p>\n<\/td>\n<td>\n<p>100 GB<\/p>\n<\/td>\n<td>\n<p>Up to 1.5 TB with auto-expansion<\/p>\n<\/td>\n<td>\n<p>Yes<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Microsoft 365 E5<\/p>\n<\/td>\n<td>\n<p>100 GB<\/p>\n<\/td>\n<td>\n<p>Up to 1.5 TB with auto-expansion<\/p>\n<\/td>\n<td>\n<p>Yes<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Note: <\/strong>Archive mailboxes are off by default. You can turn them on using the Exchange Admin Center or PowerShell. Once enabled, they auto-expand up to 1.5 TB. If your primary mailbox is full, you would not be able to send or receive emails until you archive or add more space.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"How_to_Monitor_Your_Mailbox_Size_in_Microsoft_365_Outlook\"><\/span>How to Monitor Your Mailbox Size in Microsoft 365 Outlook\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Before your inbox runs out of space and starts causing trouble, it is better to keep an eye on how much storage you have used. Now, look at how you can easily monitor your mailbox size in Microsoft 365 Outlook.<\/p>\n<ul>\n<li>First, open <strong>Outlook Online<\/strong> in your preferred web browser.<\/li>\n<li>Next, sign in using your <strong>Microsoft 365 account credentials<\/strong>.<\/li>\n<li>Then, click the <strong>Settings (\u2699\ufe0f) icon<\/strong> at the top-right corner of the screen.<\/li>\n<li>After that, scroll down and click on <strong>View all Outlook settings.<\/strong><\/li>\n<li>Now, go to the <strong>General<\/strong> tab and select <strong>Storage<\/strong> from the list.<\/li>\n<li>Finally, review the storage diagram to see how much space you&#8217;ve used and which folders are using the most.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Now_View_Your_Existing_Office_365_Mailbox_Usage\"><\/span>Now, View Your Existing Office 365 Mailbox Usage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>First, log in to your Microsoft 365 admin center.<\/li>\n<li>Then, click on the Reports section from the left menu.<\/li>\n<li>Next, go to Usage to open the Microsoft 365 usage page.<\/li>\n<li>After that, under Email activity, click View More.<\/li>\n<li>Finally, select Exchange &gt;&gt; Mailbox usage to view your storage report.<\/li>\n<\/ul>\n<p>Now, you can navigate through the best options to help you keep your inbox running smoothly.<\/p>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Simple_Ways_to_Increase_Mailbox_Size_in_Microsoft_365_Exchange_Online\"><\/span>Simple Ways to Increase Mailbox Size in Microsoft 365 Exchange Online<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>We are here with helpful solutions to upgrade the mailbox size in Microsoft 365. There are several simple ways to increase your mailbox size in Microsoft 365 Exchange Online. Once you have the details, you can use the methods below to increase your Office 365 mailbox size up to 100 GB.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_01_Upgrade_to_a_Higher_Microsoft_365_Plan\"><\/span>Method 01: Upgrade to a Higher Microsoft 365 Plan<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you&#8217;re on a lower-tier plan like Business Basic or Business Standard, your mailbox limit is 50 GB. Upgrading to a plan like Microsoft 365 E3 or E5 gives you 100 GB of primary mailbox storage.<\/p>\n<ol>\n<li>To initiate, <strong>log in<\/strong> to the <strong>Microsoft 365 Admin Center<\/strong>.<\/li>\n<li>After that, <strong>navigate<\/strong> to <strong>Billing <\/strong>and tap <strong>Your Products<\/strong> button.<\/li>\n<li>Now, <strong>hit <\/strong>on the <strong>Upgrade next <\/strong>to your <strong>current plan<\/strong>.<\/li>\n<li><strong>Select<\/strong> a plan like <strong>E3 or E5 <\/strong>and follow the <strong>on-screen<\/strong> instructions.<\/li>\n<li>After upgrading, your <strong>mailbox <\/strong>will automatically be upgraded to a <strong>100 GB limit.<\/strong><\/li>\n<\/ol>\n<p><strong>Note: <\/strong>You must be a global or billing admin to upgrade your plan to increase mailbox size in Microsoft 365 Exchange Online.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_02_Enable_Archive_Mailbox\"><\/span>Method 02: Enable Archive Mailbox<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>An archive mailbox acts like an extra storage location. It&#8217;s separate from your primary inbox and starts with 100 GB of space.<\/p>\n<ul>\n<li>Go to the Microsoft 365 Compliance Center:<\/li>\n<li>Click Data Lifecycle Management &gt;&gt; Archive.<\/li>\n<li>Now, you\u2019ll see a list of user mailboxes.<\/li>\n<li>Select the user and click Enable next to Archive Mailbox.<\/li>\n<li>The archive mailbox will appear as a second mailbox in Outlook or Outlook Web.<\/li>\n<\/ul>\n<p>Tip: You can move old or large emails here manually or with retention policies.<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_03_Increase_Office_365_Mailbox_Size_via_PowerShell\"><\/span>Method 03: Increase Office 365 Mailbox Size via PowerShell<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Using PowerShell, Microsoft 365 admins can increase the mailbox size for users who have E3 or E5 (Plan 2) licenses. This method lets you set a custom mailbox size up to 100 GB for the main mailbox.<\/p>\n<ul>\n<li>You need to be a global admin or an Exchange Online admin.<\/li>\n<li>The user\u2019s account must be using Exchange Online Plan 2, like Microsoft 365 E3 or E5.<\/li>\n<li>This method won\u2019t work for Business Basic or Standard plans because their mailbox size is limited to 50 GB.<\/li>\n<\/ul>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Steps_to_Fix_Exchange_Online_archive_mailbox_size_Using_PowerShell\"><\/span>Steps to Fix Exchange Online archive mailbox size Using PowerShell<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>Install the Exchange Online PowerShell Module. You only need to do this once per system.<\/li>\n<li>Install-Module -Name ExchangeOnlineManagement<\/li>\n<li>Enter these command to connect to Exchange Online PowerShell<\/li>\n<\/ul>\n<table style=\"background-color: #f2f2f2;\" border=\"2\">\n<tbody>\n<tr>\n<td>\n<p># Import the module<\/p>\n<p>Import-Module ExchangeOnlineManagement<\/p>\n<p># Connect to your tenant<\/p>\n<p>Connect-ExchangeOnline -UserPrincipalName admin@yourdomain.com<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>You can replace admin@yourdomain.com with your global admin email address.<\/li>\n<li>Now, users can check Current Quota Settings for the Mailbox.<\/li>\n<\/ul>\n<table style=\"background-color: #f2f2f2;\" border=\"2\">\n<tbody>\n<tr>\n<td>\n<p>Get-Mailbox user@domain.com | Select DisplayName, ProhibitSendQuota, ProhibitSendReceiveQuota, IssueWarningQuota<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Also, you can manually set higher limits (up to 100 GB for Plan 2 mailboxes):<\/li>\n<\/ul>\n<table style=\"background-color: #f2f2f2;\" border=\"2\">\n<tbody>\n<tr>\n<td>\n<p>Set-Mailbox user@domain.com -ProhibitSendReceiveQuota 100GB -ProhibitSendQuota 99GB -IssueWarningQuota 98GB<\/p>\n<p>Get-Mailbox user@domain.com | Select DisplayName, ProhibitSendQuota, ProhibitSendReceiveQuota, IssueWarningQuota<\/p>\n<p>Disconnect-ExchangeOnline<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Method_04_Backup_and_Free_Up_Server_Space_of_your_Exchange_Online_Archive_Mailbox\"><\/span>Method 04: Backup and Free Up Server Space of your Exchange Online Archive Mailbox<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To free up space in your Exchange Online archive mailbox without losing important data, you can use the <strong>Aryson Office 365 Backup &amp; Restore Tool<\/strong>. It allows you to back up all your archive emails to your local system in formats like PST, MBOX, EML, or PDF. Once your backup is safely stored, you can delete older emails from your mailbox to clear up space on the server. Along with that, it will keep your mailbox clean and run smoothly. So that your data stays safe and accessible.<\/p>\n<h4 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Follow_these_Steps_to_Free_Up_Server_Space_and_Increase_Mailbox_Size\"><\/span>Follow these Steps to Free Up Server Space and Increase Mailbox Size\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>Open the <strong>Aryson Office 365 Backup &amp; Restore Tool<\/strong> and click Backup to proceed with.<\/li>\n<li>Then, enter your <strong>Microsoft 365 credentials<\/strong> (user ID and password) and sign in.<\/li>\n<li>Now, you can choose <strong>Archive Mailbox<\/strong> to back up your Exchange Online archive data.<\/li>\n<li>Pick any of the given formats and mark free up server space option along with saving path.<\/li>\n<li>To increase mailbox size in Microsoft 365 Exchange Online, click on the <strong>Convert Button.<\/strong><\/li>\n<\/ul>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If your mailbox hits the storage space on your system, it can slow down your work and stop emails from coming in. Hence, we provided some easy ways to increase your storage. You can turn on archive mailboxes, use PowerShell, or switch to a plan that gives you more space. Just make sure of your mailbox size and take action before it reaches the limit. That way, your emails will keep working smoothly without any problems. Other than that, you can <a href=\"https:\/\/www.arysontechnologies.com\/blog\/how-to-backup-email-from-office-365-admin-portal\/\"><strong>take backup of your Office 365 data<\/strong><\/a>. Thereafter, you can free up server space to increase mailbox size in Microsoft 365 exchange online.<\/p>\n<h3 class=\"faq-main_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_FAQs\"><\/span>Frequently Asked Questions (FAQs)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1754311383600\"><strong class=\"schema-faq-question\"><strong>Q1. What is the default mailbox size in Microsoft 365 Exchange Online?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> The default mailbox size is 50 GB for Business Basic and Business Standard plans. For E3 and E5 plans, it starts at 100 GB.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754311675965\"><strong class=\"schema-faq-question\"><strong>Q2. Can I increase my mailbox size beyond 100 GB?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>Yes, you can. By enabling the <strong>auto-expanding archive mailbox<\/strong>, users on Exchange Online Plan 2 (like E3\/E5) can exceed 100 GB.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754311804832\"><strong class=\"schema-faq-question\"><strong>Q3. What happens when my mailbox reaches its limit?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans: <\/strong>When your mailbox is full, you won&#8217;t be able to send or receive new emails until you free up space or increase the limit.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1754311818586\"><strong class=\"schema-faq-question\"><strong>Q4. What is an archive mailbox in Office 365?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> An archive mailbox is a secondary mailbox that allows you to store older or less frequently used emails. It helps reduce your primary mailbox size.<\/p> <\/div> <\/div>\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;2784&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;11&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;4.1&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;4.1\\\/5 - (11 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Increase Mailbox Size in Microsoft 365 Exchange Online - A Complete Guides&quot;,&quot;width&quot;:&quot;116.4&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: 116.4px;\">\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            4.1\/5 - (11 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>If you are running out of mailbox space in Microsoft 365, it can feel like hitting a wall. One moment,<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/\">Read More<\/a><\/p>\n","protected":false},"author":5,"featured_media":2785,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-backup"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Increase Microsoft 365 Mailbox Size - A Complete Guides<\/title>\n<meta name=\"description\" content=\"Explore methods to Increase Microsoft 365 Mailbox Size easly. 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He is an expert Email Forensic, Cloud Computing, and a passionate nerd with over 10 years of experience in technical content writing. He writes about Cloud Migration, Database Recovery, Email Backup, Windows, Mac, and Tech.","url":"https:\/\/www.arysontechnologies.com\/how-to\/author\/rohan-wiese\/"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311383600","position":1,"url":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311383600","name":"Q1. What is the default mailbox size in Microsoft 365 Exchange Online?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans:<\/strong> The default mailbox size is 50 GB for Business Basic and Business Standard plans. For E3 and E5 plans, it starts at 100 GB.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311675965","position":2,"url":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311675965","name":"Q2. Can I increase my mailbox size beyond 100 GB?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>Yes, you can. By enabling the <strong>auto-expanding archive mailbox<\/strong>, users on Exchange Online Plan 2 (like E3\/E5) can exceed 100 GB.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311804832","position":3,"url":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311804832","name":"Q3. What happens when my mailbox reaches its limit?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans: <\/strong>When your mailbox is full, you won't be able to send or receive new emails until you free up space or increase the limit.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311818586","position":4,"url":"https:\/\/www.arysontechnologies.com\/how-to\/increase-microsoft-365-mailbox-size\/#faq-question-1754311818586","name":"Q4. What is an archive mailbox in Office 365?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans:<\/strong> An archive mailbox is a secondary mailbox that allows you to store older or less frequently used emails. 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