Thunderbird Community Forum

I’m using the Windows 11 version of the Thunderbird app, but when I try to add my Outlook account and enter my password, it shows “Authentication failed. Please check your username and password,” and I can’t complete the Outlook setup. I’ve tried changing my Microsoft account password and entering an app password, but neither worked.

Trying to set up Thunderbird on new computer. I do NOT want to import anything but address book from old computer. I use Thunderbird to Gmail since I also have an Android phone and want to access emails with Thunderbird and Gmail. I downloaded the Thunderbird installer, but I cannot log into Gmail when the Thunderbird setup asks me to EVEN THOUGH I know I am using the correct Gmail password, it is rejected as incorrect. Do I need to set up a whole new Gmail account? I MUST use the same email address, and I doubt Google will allow me to set up a new account with that address.

Please help.

Thunderbird ver 140.0 (64-bit) on Windows 11.

Brand new, fresh installation of Thunderbird. - Added a GMail account. That worked. - I tried to add an account with my personal domain. I enter my name, the email account, and Thunderbird gets stuck in an unending loop looking up the configuration. - Other email clients have successfully looked up the config and did the setup without a problem. - The email account is handled via IONOS.com servers. - If you gave me a manual setup option I could handle it but there is none; TB goes straight into trying to handle it itself.

Any ideas?

TY, Frank

Hello community!

I use Thunderbird desktop for two emails: personal outlook.com (ms365 or whatever ma calls it) and school exchange account.

Exchange works fine using owl and is able to sync calendar correctly. For personal email, it appears I can only connect via imap instead of MS’s protocol, which limits its ability to sync calendar. I’m wondering if there’s a way to login personal ms email similar to exchange to sync calendar etc.?

Thx in advance for ur help :-)

I apologize in advance for the language, I'm writing from a translator. Thunderbird on several accounts, every few days requires a password ... "login to the server failed, enter a new password". Just in case, I changed the passwords on these accounts (with the option to remember), a few days of peace and again the problem. However, logging in with the old passwords before and the new ones now on the server is no problem at all.

I reinstalled TB but unfortunately it doesn't help. The same on the stationary and laptop, what could be the problem? Currently, email is available only on the server, I do not have access to Thunderbird.

I'm using Version 128.6.0esr in Windows, but can't do drag and drop file for attachment at all. Previously it still can use this feature but suddenly it came to a stop.

The icon Ø will appear when we are trying to drag and drop a file to the create message window.

We already have tried the troubleshoot with no result.

Any advice on how to repair this?

Thanks

I have used Thunderbird for many years and and have loved it. However, recently my "Local Folders Inbox" have been extremely slow (deleting emails, reviewing an email, etc.). I have tried every suggestion that I have found without any change: reducing emails in the folder (down to about 75 remaining), compacting and repairing the folder, deleting and rebuilding all of the msf files and global database, disabling all addons, empty trash and junk, clear the cache, disable hardware acceleration, exclusion in antivirus, etc. It has become very frustrating. Any suggestions would be greatly appreciated.

I got an email from Microsoft saying my Live.com or Outlook.com email accounts won't be supported in Thunderbird UNLESS I change the settings to OAuth2 in incoming and outgoing server settings.

I even REMOVED the email account and re-added it making sure it was OAuth2.

But for my live.com & outlook.com email accounts I continually get prompts for passwords from Thunderbird. Sometimes I can't even click the RED X at the upper right to shut the prompt down. I just happens over and over until I give it what it wants.

I am tempted to shut down all Microsoft email accounts and switch to Gmail.

I have Thunderbird version 115.12.2 (64-bit) I used Windows 11 23H2 build 22631.3810 Windows Feature Experience Pack 1000.22700.1020.0

Any idea how to stop these prompts?

I like Thunderbird much more than any other email program I have ever used, and would like to keep it

I moving from classic outlook to Thunderbird and I am having trouble finding how to change fonts and color in signatures for my emails. I do not do html it is a simple signature; name company name and phone numbers. I search and found no help. Is there a way to change color and font in the reply to an email? Sorry I know this sounds simple but I have been using outlook since it came out so this is similar but just enough to give me trouble. Thank you for any help, rick

Two questions:

1) My TBird v115.18 (32-bit, Windows 7) no longer allows me to get emails from the server. This just started today (7/17/25). I get a message that says there are no emails. The emails download properly on my Windows 10 PC with the latest 64-bit program. Is there anything I can do or change that will restore that function on my Win7 PC?

2) Is there a 64-bit version that will run on a Windows 7 PC and perhaps solve the problem in #1 above? If so, how can I get the proper 64-bit version? The latest TBird 64-bit will not run on Windows 7.

Thanks for any and all help.

TC

I can't find a setting that will allow marking messages as read only after I read them. By that I mean only after I click on the message to open it in its own tab. I view the new messages in a split screen.

The current settings allow me to leave them bold as if I hadn't read them even after I've clicked on the message and viewed it in the full TB pane

or

Mark them as read as soon as they're displayed in the bottom half of the split screen.

I don't find either of these options desirable.

As you can see in the screenshot, the umlauts are missing in many emails. Unfortunately, the corresponding fonts can no longer be set in Thunderbird; I use version 140.6.0esr (32-bit). Where can I set that ä, ö, ü, ß (...) are displayed normally? Greetings from Berlin, Markus

Since awhile while, the items I send, don';t show up in the sent folder of that account. The complete folder is empty, which means that I also lost messages. I didn't make any changes to the settings, it might have happened due to an update maybe?

My other accounts work still fine. I checked all settings I could think of that might affect it, but haven't found a solution. I'm getting pretty desperate and hope someone can help me out.

It's an IMAP account. I've selected the 'sent folder' in subscribed. 'When sending messages, automatically' the 'place a copy in' is checked and directed to the email address. Also tried it with checking 'other' and select email address. I also just tried to 'local folder', but nothing happens.

I hope my description is fine. If more info is needed to tackle this problem, I like to hear!

Started getting error April 10. I have SSL/TLS and Oauth2 set for Thunderbird account server and smtp. Looked thru lots of web messages - no joy. Via web browser I can connect to my Yahoo email without issue. My gmail account on Thunderbird still works fine (with its unique third party password). I am on current Thunderbird release 115.9.0 (64 bit). I disabled the only add-on that Thunderbird was using. Windows 11 Pro which is up to date. Plenty of open disk space. Have rebooted my PC multiple times.

Looking for suggestions Thanks Bob

The inbox font in the Thunderbird email client on my Mac is super tiny, and it's very hard to read. I can't figure out how to make it larger. Is there a way to do this? I really like Thunderbird so far, but if I can't read it, I can't use it.

Thanks! Mark

Hello Thunderbird community,

I’ve been exploring Thunderbird’s integration options and noticed that while email sync with Outlook accounts works fine, calendar and contact synchronization with Outlook/Exchange Online is currently unavailable.

This is a significant limitation for users who rely on Outlook’s ecosystem for scheduling and address book management. I’d like to ask:

Is there an official roadmap for when Outlook calendar sync will be supported in Thunderbird?

Will Outlook contacts sync be added at the same time, or as a separate feature?

I believe many users would benefit from clarity on this, since full Outlook integration is critical for those working in Microsoft-centric environments.

Thanks in advance to the Thunderbird team and volunteers for any updates or guidance.

TDS is dropping support for email services 10/31/2026. They are providing an option to migrate our data to a new provider Everymail, I'm wondering what other options I have and what it means to my current mail data(Inbox, Archive etc..) if I go to another provider(not Everymail)?

I've used just the default profile I setup when I started using Thunderbird, I can't tell where all of that data is stored and I don't want to loose some of the Archived messages from over the years.

 When I click on properties for the Thunderbird Archive Folder it shows:

mailbox://botto%40chorus.net@mail.tds.net/Archive

Is this data on my local storage or on TDS?

Any help here would be appreciated, Thanks

Thunderbird Version 142.0 will open when I chose a file to send to mail recipient using win 11, but the new email screen doesn't open so no file attaches. All my defaults are correct, there is a proper mail recipient entry in the appdata sendto file and there is a key in the registry for Thunderbird under client mail.