{"id":46006,"date":"2026-03-27T14:02:38","date_gmt":"2026-03-27T14:02:38","guid":{"rendered":"https:\/\/www.adviksoft.com\/blog\/?p=46006"},"modified":"2026-05-04T08:58:38","modified_gmt":"2026-05-04T08:58:38","slug":"thunderbird-not-working-with-office-365","status":"publish","type":"post","link":"https:\/\/www.adviksoft.com\/blog\/thunderbird-not-working-with-office-365\/","title":{"rendered":"Thunderbird Not Working With Office 365 &#8211; Fixed"},"content":{"rendered":"<p>Mozilla Thunderbird is a popular open-source email client for its flexibility, security, and ease of use. It allows users to manage multiple email accounts, like Office 365, Gmail, etc. at one platform. Sometimes Thunderbird stops working with Office 365 due to incorrect settings, authentication conflicts, or security updates. If you are also facing the Thunderbird not working with Office 365 issue, then this post is for you. In this article, we&#8217;ll explain the cause behind this issue and the methods to fix it.<\/p>\n<h2>Why Is Thunderbird Not Working With Office 365?<\/h2>\n<ul>\n<li>Entering incorrect Office 365 login credentials and selecting incorrect settings prevents Thunderbird from configuring the Office 365 account.<\/li>\n<li>If IMAP and SMTP are disabled in Office 365, then Thunderbird stops working with Office 365.<\/li>\n<li>If Thunderbird is not using the correct authentication methods, it may fail to connect with Office 365.<\/li>\n<li>Office 365 policies may refuse older versions of Thunderbird without modern authentication.<\/li>\n<\/ul>\n<h2>How to Fix Thunderbird Not Working With Office 365?<\/h2>\n<p>There are several methods to fix Thunderbird stopped syncing with Office 365 account. Have a quick look at each method and practice them carefully to fix the Thunderbird not connecting to Office 365 issue.<\/p>\n<h3>#1. Update Thunderbird<\/h3>\n<ol>\n<li>Open Thunderbird on your system.<\/li>\n<li>Go to Help &gt;&gt; About Thunderbird.<\/li>\n<li>Install the latest updates<\/li>\n<\/ol>\n<h3>#2. Enable IMAP in Office 365<\/h3>\n<p>Thunderbird relies on IMAP and SMTP to sync messages between Office 365 and the client. So, make sure IMAP and SMTP are enabled in the Office 365 account.<\/p>\n<ol>\n<li>Log into Office 365 account<\/li>\n<li>Click on Gear icon and choose Settings.<\/li>\n<li>Choose mail option and click on Sync Email.<\/li>\n<li>Now, look for IMAP and SMTP<\/li>\n<li>Make sure IMAP and SMTP are enabled<\/li>\n<\/ol>\n<h3>#3. Choose OAuth2 for Authentication<\/h3>\n<ol>\n<li>Open Thunderbird on your system.<\/li>\n<li>Click on the three horizontal line and choose Account Settings.<\/li>\n<li>Choose Office 365 account from left panel and click on Server Settings.<\/li>\n<li>Select the OAuth2 Authentication method from the dropdown list.<\/li>\n<li>After that, restart Thunderbird and check issue is solved or not.<\/li>\n<\/ol>\n<h3>#4. Reconfigure Office 365 Account in Thunderbird<\/h3>\n<ol>\n<li>Open Thunderbird on your system.<\/li>\n<li>Click on Tools and select Account Settings.<\/li>\n<li>Choose Account Actions and click on Remove.<\/li>\n<li>Now, restart Thunderbird and click on Email under Set Up Another Account.<\/li>\n<li>Enter your Office 365 credentials and click Continue.<\/li>\n<li>Click on Configure manually and enter the following IMAP\/POP3 Settings:<\/li>\n<li>Incoming Server Details (IMAP)<br \/>\nServer: outlook.office365.com<br \/>\nPort: 993<br \/>\nEncryption: SSL\/TLS<br \/>\nAuthentication: OAuth2<\/li>\n<li>Outgoing Server Details (SMTP)<br \/>\nServer: smtp.office365.com<br \/>\nPort: 587<br \/>\nEncryption: STARTTLS<br \/>\nAuthentication: OAuth2<\/li>\n<li>For POP3<br \/>\nServer: outlook.office 365.com<br \/>\nPort: 995<br \/>\nEncryption: SSL\/TLS<br \/>\nAuthentication: OAuth2<\/li>\n<li>After that, click the Done button to save changes and restart Thunderbird to check issue is solved or not.<\/li>\n<\/ol>\n<h2>Professional Solution to Fix Thunderbird Stopped Working with Office 365<\/h2>\n<p>While troubleshooting, you might be completely focused on fixing the issue of Thunderbird not working with Office 365. But what to do if something goes wrong during the process and you lose access to all your emails stored in Thunderbird?<\/p>\n<p>It makes it clear how important it is to have a backup before making any major configuration changes.<\/p>\n<p>Instead of manually exporting folders one by one, you can choose a simpler approach. Using the <strong>Advik <a href=\"https:\/\/www.adviksoft.com\/thunderbird\/converter.html\">Thunderbird Converter<\/a><\/strong> allows you to <a href=\"https:\/\/www.adviksoft.com\/blog\/backup-thunderbird-emails\/\">backup Thunderbird emails<\/a> along with attachments. It offers 25+ saving options to save Thunderbird emails into multiple formats such as PST, MBOX, EML, PDF, HTML, TXT, etc.<\/p>\n<p><a aria-label=\"Download Advik Thunderbird Converter\" href=\"https:\/\/www.adviksoft.com\/dl\/advik-thunderbird-converter.exe\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-45702\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Download-Button-e1525685682329-1-1-1.png\" alt=\"\" width=\"213\" height=\"55\" \/><\/a><\/p>\n<p>1. Run the tool and choose your Thunderbird profile.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-46011\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/backup-thunderbird-emails-1-2.png\" alt=\"run the tool\" width=\"700\" height=\"583\" \/><\/p>\n<p>2. Select the mailbox folders &amp; subfolders.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-46010\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/backup-thunderbird-emails-1-1.png\" alt=\"Thunderbird not working with Office 365\" width=\"700\" height=\"589\" \/><\/p>\n<p>3. Choose a saving option from the given list.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-46009\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/backup-thunderbird-emails-2.png\" alt=\"Choose a saving option\" width=\"704\" height=\"595\" \/><\/p>\n<p>4. Browse destination location and click Next.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-46008\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/backup-thunderbird-emails-3-1.png\" alt=\"Thunderbird not working with Office 365\" width=\"697\" height=\"588\" \/><\/p>\n<p>The software will start exporting Thunderbird data in your desired format. If you face any issues with your Thunderbird account, then you can access data from this backup file.<\/p>\n<h3>Final Words<\/h3>\n<p>In this post, we have explained the multiple solutions to fix Thunderbird not working with Office 365 issue. You can try these solutions to solve Office 365 authentication failure issue. Here, we have also shared the expert&#8217;s suggested tool to safeguard Thunderbird data. Hence, make sure to save your Thunderbird files before attempting the manual tricks to solve Thunderbird won&#8217;t connect to Office 365.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mozilla Thunderbird is a popular open-source email client for its flexibility, security, and ease of use. It allows users to manage multiple email accounts, like Office 365, Gmail, etc. at one platform. Sometimes Thunderbird stops working with Office 365 due to incorrect settings, authentication conflicts, or security updates. If you are also facing the Thunderbird [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":46024,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[],"class_list":["post-46006","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mozilla-thunderbird"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thunderbird Not Working With Office 365 - Fixed<\/title>\n<meta name=\"description\" content=\"Learn how to fix Thunderbird not working with Office 365. 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This article will explain several troubleshooting steps to Thunderbird stopped working with Office 365.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.adviksoft.com\/blog\/thunderbird-not-working-with-office-365\/\" \/>\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=\"2026-03-27T14:02:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-04T08:58:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Thunderbird-Not-Working-With-Office-365-1.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=\"Alora Eve\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Alora Eve\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/\"},\"author\":{\"name\":\"Alora Eve\",\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/#\\\/schema\\\/person\\\/cca7cb11d027fd94f9471c75d1f0c26a\"},\"headline\":\"Thunderbird Not Working With Office 365 &#8211; Fixed\",\"datePublished\":\"2026-03-27T14:02:38+00:00\",\"dateModified\":\"2026-05-04T08:58:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/\"},\"wordCount\":670,\"publisher\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Thunderbird-Not-Working-With-Office-365-1.png\",\"articleSection\":[\"Mozilla Thunderbird\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/\",\"url\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/\",\"name\":\"Thunderbird Not Working With Office 365 - Fixed\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/thunderbird-not-working-with-office-365\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Thunderbird-Not-Working-With-Office-365-1.png\",\"datePublished\":\"2026-03-27T14:02:38+00:00\",\"dateModified\":\"2026-05-04T08:58:38+00:00\",\"description\":\"Learn how to fix Thunderbird not working with Office 365. 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