{"id":20655,"date":"2026-01-30T06:01:11","date_gmt":"2026-01-30T06:01:11","guid":{"rendered":"https:\/\/www.sysinfotools.com\/blog\/?p=20655"},"modified":"2026-08-04T06:46:50","modified_gmt":"2026-08-04T06:46:50","slug":"fix-thunderbird-not-working-with-office-365","status":"publish","type":"post","link":"https:\/\/www.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/","title":{"rendered":"Quick Solution to Fix Thunderbird Not Working with Office 365"},"content":{"rendered":"<div class=\"p-4 mb-4\" style=\"border: 2px solid #005EFF; border-radius: 30px;\">\n<p><em>&ldquo;I have tried every possible way for the server setting combinations. However, Thunderbird returns the error each time as: &lsquo;<\/em><strong><em>Login to server smtp.office365.com with username abcd@xyz failed<\/em><\/strong><em>.&rsquo; It is followed by another message stating, &lsquo;<\/em><strong><em>Sending of the message failed. Unable to authenticate outgoing server. Recheck the password and verify the authentication settings in Account Settings<\/em><\/strong><em>.&rsquo; I cannot find the exact problem or a suitable solution to fix it. Suggest one.&rdquo;<\/em><\/p>\n<p><strong>-Lara Parker<\/strong><\/p>\n<\/div>\n<div class=\"block_sum\">\n<p>Thunderbird and Office 365 functioned flawlessly across eachother until the security protocols were updated and authentication methods evolved. So, what was earlier easily accessible became stuck, and login attempts result in failure, authentication blockers, and an unresponsive server, even with correct credentials. This difficulty primarily exists because of the differences between n Thunderbird and Office 365 environments. Next, what you can do is to explore ideal solutions to fix Thunderbird not working with Office 365 issue through this guide. Also, learn about the smart <strong>SysInfo<\/strong>&nbsp;<a href=\"https:\/\/www.sysinfotools.com\/thunderbird-backup.php\" target=\"_blank\" rel=\"noopener\"><strong>Thunderbird Backup Tool<\/strong><\/a> for instant and simple fixes.&nbsp;<\/p>\n<div class=\"blog-btn\">\n<ul id=\"db-btn-container\" class=\"nav nav-tabs mt-4\" role=\"tablist\">\n<li class=\"nav-item\"><a id=\"windows-tab\" class=\"nav-link active\" role=\"tab\" href=\"#windows\" data-toggle=\"tab\" aria-controls=\"windows\" aria-selected=\"true\"><i class=\"icon-windows\"><\/i> Windows<\/a><\/li>\n<li class=\"nav-item\"><a id=\"mac-tab\" class=\"nav-link\" role=\"tab\" href=\"#mac\" data-toggle=\"tab\" aria-controls=\"mac\" aria-selected=\"false\"><i class=\"icon-apple\"><\/i> Mac<\/a><\/li>\n<\/ul>\n<div id=\"db-btn-containerContent\" class=\"tab-content my-2\">\n<div id=\"windows\" class=\"tab-pane fade active show\" role=\"tabpanel\" aria-labelledby=\"windows-tab\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfo-Thunderbird-Email-Backup-Tool.exe\"><i class=\"icon-windows\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/thunderbird-backup.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\n<div id=\"mac\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"mac-tab\"><a class=\"sum-d-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfo-Thunderbird-Email-Backup-Tool-mac.dmg\"><i class=\"icon-apple\"><\/i> Download<\/a> <a class=\"sum-b-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/mac-thunderbird-converter.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon icon-basket\"><\/i> Buy Now<\/a><\/div>\n<\/div>\n<\/div>\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\/fix-thunderbird-not-working-with-office-365\/#Reasons_Why_Thunderbird_Failed_to_Connect_to_Office_365\" >Reasons Why Thunderbird Failed to Connect to Office 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.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/#Multiple_Ways_to_Fix_Thunderbird_Not_Working_with_Office_365\" >Multiple Ways to Fix Thunderbird Not Working with Office 365<\/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.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/#Manual_Fix_Thunderbird_Not_Working_with_Microsoft_365\" >Manual Fix Thunderbird Not Working with Microsoft 365<\/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.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/#Professional_Fix_Thunderbird_Not_Working_with_Office_365\" >Professional Fix Thunderbird Not Working with Office 365<\/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.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/#Conclusion\" >Conclusion&nbsp;<\/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.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Reasons_Why_Thunderbird_Failed_to_Connect_to_Office_365\"><\/span>Reasons Why Thunderbird Failed to Connect to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Below are the top reasons why Thunderbird often doesn&rsquo;t configure with O365:<\/p>\n<ul>\n<li aria-level=\"1\">Microsoft disabled basic authentication and enforced OAuth 2.0<\/li>\n<li aria-level=\"1\">Due to incorrect incoming (IMAP) and outgoing (SMTP) settings<\/li>\n<li aria-level=\"1\">Access blockers are caused by the default security settings&nbsp;<\/li>\n<li aria-level=\"1\">Conditional authentication and access policies&nbsp;<\/li>\n<li aria-level=\"1\">Limitations of the shared mailboxes may be a reason&nbsp;<\/li>\n<li aria-level=\"1\">Network or firewall blockers due to outdated Thunderbird&nbsp;<\/li>\n<li aria-level=\"1\">Temporary server or internet network issues are a cause too&nbsp;<\/li>\n<\/ul>\n<table border=\"1\">\n<tbody>\n<tr>\n<td>\n<p><strong>Common Error Messages When Thunderbird Stopped Working with Office 365<\/strong><\/p>\n<ul>\n<li aria-level=\"1\">Failed to connect to Office 365<\/li>\n<li aria-level=\"1\">Rejected login even with the correct password<\/li>\n<li aria-level=\"1\">IMAP is working but SMTP fails to connect<\/li>\n<li aria-level=\"1\">Authentication in a loop after credentials input<\/li>\n<li aria-level=\"1\">Thunderbird is not working with Microsoft 365 after the security update<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Multiple_Ways_to_Fix_Thunderbird_Not_Working_with_Office_365\"><\/span>Multiple Ways to Fix Thunderbird Not Working with Office 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Any user can try the following basic and advanced solutions to fix the connectivity issue between Mozilla Thunderbird and Office 365. But remember, there are some limits to the manual methods.&nbsp;<\/p>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Manual_Fix_Thunderbird_Not_Working_with_Microsoft_365\"><\/span>Manual Fix Thunderbird Not Working with Microsoft 365<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The different methods for free fix are mentioned as follows:&nbsp;<\/p>\n<h4 class=\"main_heading\">Way 1: Implementing Correct Server and Authentication Settings&nbsp;<\/h4>\n<p>It is very necessary to use OAuth 2.0 as the authentication model and input the correct server details for the connection. Below are the correct details and the steps to set up OAuth. These are:&nbsp;<\/p>\n<ol>\n<li aria-level=\"1\">Incoming Server Details (<strong>IMAP<\/strong>)<\/li>\n<\/ol>\n<table border=\"1\">\n<tbody>\n<tr>\n<td>\n<p><strong>Server: <\/strong><strong>outlook.office365.com<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Port: <\/strong>993<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Encryption: <\/strong>SSL\/TLS<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Authentication: <\/strong>OAuth2<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol start=\"2\">\n<li><strong>Outgoing Server Details (SMTP)<\/strong><\/li>\n<\/ol>\n<table border=\"1\">\n<tbody>\n<tr>\n<td>\n<p><strong>Server: <\/strong><strong>smtp.office365.com<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Port: <\/strong>587<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Encryption: <\/strong>STARTTLS<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>Authentication: <\/strong>OAuth2<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol start=\"3\">\n<li aria-level=\"1\">Steps to <strong>set up OAuth authentication<\/strong>:<\/li>\n<\/ol>\n<ul>\n<li aria-level=\"1\">Within <strong>Thunderbird,<\/strong> from the <strong>More<\/strong> menu, click <strong>Account Settings.<\/strong>&nbsp;<\/li>\n<li aria-level=\"1\">There, in the <strong>Server Settings,<\/strong> browse <strong>Outgoing Server<\/strong>, and click<strong> Edit<\/strong>.<\/li>\n<li aria-level=\"1\">Next, under <strong>Authentication Mode<\/strong>, choose <strong>OAuth2<\/strong>.<\/li>\n<li aria-level=\"1\">Check other details, exit and restart Thunderbird, and try connecting with Office 365.&nbsp;<\/li>\n<\/ul>\n<h4 class=\"main_heading\">Way 2: Fix Thunderbird Not Working with Office 365 in M365<\/h4>\n<p>Another way is to enable IMAP and SMTP protocols in both Office 365 and Thunderbird for connectivity. Steps are:<\/p>\n<ol>\n<li aria-level=\"1\"><strong>Sign in<\/strong> to your <strong>Office 365 account<\/strong> and go to its <strong>Settings<\/strong>.&nbsp;<\/li>\n<li aria-level=\"1\">From there, click on <strong>Mail<\/strong> and then tap <strong>Sync Email<\/strong>.&nbsp;<\/li>\n<li aria-level=\"1\">At last, ensure that both <strong>IMAP <\/strong>and<strong> SMTP<\/strong> are <strong>enabled<\/strong> there.&nbsp;<\/li>\n<\/ol>\n<h4 class=\"main_heading\">Way 3: Updating Thunderbird and Office 365 to Latest Versions&nbsp;<\/h4>\n<ol>\n<li aria-level=\"1\">In <strong>Thunderbird<\/strong>, go to <strong>Help<\/strong> and check for <strong>Updates<\/strong>.&nbsp;<\/li>\n<li aria-level=\"1\">If any update is available, complete it.&nbsp;<\/li>\n<li aria-level=\"1\">Similarly, look for any <strong>Office 365 updates<\/strong> and proceed with their completion.&nbsp;<\/li>\n<\/ol>\n<h4 class=\"main_heading\">Way 4: Reconfigure Office 365 Account in Thunderbird&nbsp;<\/h4>\n<ol>\n<li aria-level=\"1\">Initially, run <strong>Thunderbird<\/strong> and click on the <strong>O365 email address.&nbsp;<\/strong><\/li>\n<li aria-level=\"1\"><strong>Remove it<\/strong>, and then under <strong>Email Accounts<\/strong>, choose to setup a account.&nbsp;<\/li>\n<li aria-level=\"1\">Further, enter<strong> Office 365 username <\/strong>and <strong>password<\/strong> and choose to <strong>setup account manually<\/strong>.&nbsp;<\/li>\n<li aria-level=\"1\">Finally, enter the <strong>correct credentials<\/strong> as provided above in <strong>1st way<\/strong> and tap <strong>Done<\/strong> to connect.&nbsp;<\/li>\n<\/ol>\n<h5 class=\"main_heading\">Shortcomings of the Manual Method&nbsp;<\/h5>\n<ul>\n<li aria-level=\"1\">It is very time-consuming and complex, especially for non-tech or novice users.<\/li>\n<li aria-level=\"1\">User cannot depend on any one free solution and may need to try them all out.&nbsp;<\/li>\n<li aria-level=\"1\">High risk of data loss prevails in these methods without technical skills.&nbsp;<\/li>\n<li aria-level=\"1\">No immediate results are available and may vary based on the issue and fixing method.&nbsp;<\/li>\n<\/ul>\n<h3 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Professional_Fix_Thunderbird_Not_Working_with_Office_365\"><\/span>Professional Fix Thunderbird Not Working with Office 365<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Since the manual methods aren&rsquo;t a direct fix, <strong>Thunderbird Backup Tool<\/strong> acts as an immediate solution. It enables users to instantly save Thunderbird data in the desired format or directly import it into Office 365 without hassle. Additionally, it has advanced filters for duplicates, selective exports, and much more. Moreover, it works directly with Thunderbird MBOX files and is easy to use across all OS, with or without technical skills.&nbsp;<\/p>\n<p><strong>Note:<\/strong> To try its functionality and perform a few free exports, download the <strong>Demo Version<\/strong> of the software.&nbsp;<\/p>\n<h4 class=\"main_heading\">Procedure: When Thunderbird Failed to Connect to Office 365<\/h4>\n<ol>\n<li>Launch the <strong>Thunderbird Backup Software<\/strong> and click <strong>Continue<\/strong> once it starts.&nbsp;<\/li>\n<li>Then, import the <strong>Thunderbird MBOX files<\/strong> or <strong>profile<\/strong> and click <strong>Next<\/strong>.&nbsp;<\/li>\n<li>Afterward, check the <strong>preview <\/strong>of the emails and select the folders to move. Tap <strong>Next<\/strong>.&nbsp;<\/li>\n<li>Furthermore, opt for a desired<strong> file format <\/strong>or an <strong>email client <\/strong>in which you want to secure data.&nbsp;<\/li>\n<li>Finally, apply the filters, pick a destination, and click <strong>Convert<\/strong> to complete.&nbsp;<\/li>\n<\/ol>\n\n<p><strong>Also Read: <a href=\"https:\/\/www.sysinfotools.com\/blog\/thunderbird-not-responding-on-windows\/\" target=\"_blank\" rel=\"noopener\">Fix Thunderbird Not Responding on Windows Issue<\/a><\/strong><\/p>\n\n<h2 class=\"main_heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Thunderbird isn&rsquo;t the problem; it&rsquo;s just that Microsoft has raised its security standards and requires a proper connection without hampering data. We have seen various manual fixes in this guide. If that doesn&rsquo;t work out for you, it is best to secure your data and create a backup for it with the dedicated <strong>SysInfo Thunderbird Email Backup Tool<\/strong>. It is an effortless, time and cost-saving solution with 100% accurate results and no loss.&nbsp;<\/p>\n<h3 class=\"faq_heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<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-1769749933613\"><strong class=\"schema-faq-question\">Q1. How do I fix Thunderbird not working with Office 365?<\/strong> <p class=\"schema-faq-answer\"><strong>Ans.<\/strong> If Thunderbird isn\u2019t working with Office 365, try these:<br\/>1. Use OAuth 2.0 authentication with the correct IMAP\/SMTP settings<br\/>2. Recreate the Office 365 account in Thunderbird\u00a0<br\/>3. Update Office 365 and Thunderbird accounts\u00a0<br\/>4. Disable firewall and antivirus settings\u00a0<br\/>5. Use App Password instead of Normal Password\u00a0<br\/>6. Create a backup with an automated backup tool<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1769749986588\"><strong class=\"schema-faq-question\">Q2. Does Office 365 require OAuth 2.0 for Thunderbird login?<\/strong> <p class=\"schema-faq-answer\">Ans. Yes, basic authentication doesn\u2019t work much anymore, and OAuth 2.0 is required for the login.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1769749994564\"><strong class=\"schema-faq-question\">Q3. Can Thunderbird work with shared mailboxes in Office 365?<\/strong> <p class=\"schema-faq-answer\">Ans. Yes, if using the <strong>Thunderbird Mail Backup Tool<\/strong>, it can work with shared mailboxes in Office 365.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1769750009307\"><strong class=\"schema-faq-question\">Q4. Which is the best tool to fix Thunderbird not working with Office 365?<\/strong> <p class=\"schema-faq-answer\">Ans. The best tool to fix Thunderbird stopped working with Office 365 is the <strong>SysInfo Thunderbird Email Backup Tool<\/strong>.<\/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;20655&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;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;Quick Solution to Fix Thunderbird Not Working with Office 365&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","protected":false},"excerpt":{"rendered":"<p>&ldquo;I have tried every possible way for the server setting combinations. However, Thunderbird returns the error each time as: &lsquo;Login<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":20657,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1594],"tags":[],"class_list":["post-20655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-backup"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Quick Solution to Fix Thunderbird Not Working with Office 365<\/title>\n<meta name=\"description\" content=\"Facing Thunderbird and Office 365 sync issues? Follow this quick solution guide to fix connection errors and restore email access fast.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sysinfotools.com\/blog\/fix-thunderbird-not-working-with-office-365\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quick Solution to Fix Thunderbird Not Working with Office 365\" \/>\n<meta property=\"og:description\" content=\"Facing Thunderbird and Office 365 sync issues? 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