Thunderbird Community Forum

Dear Support,

we can not log-in with our office 365 account. We need to log-in with "Exchange Add-on erforderlich", but we receive this error message.

I attached you some screenshots. We do not understand why this error appears.

When we log-in with option "Exchange" then it works but we need the other option because we need to have the sub-folders.

Please help us.

Best regards, Andreas

The export says to hold over pix. Computer says files are exported and continue on phone but phone is still stuck on importing. I don't know where the ap window is but I downloaded the latest version

I have four different email accounts. A week ago, all incoming and outgoing traffic suddenly stopped . Webmail works normally. I have no viruses, trojans, etc. I deleted one of the accounts and tried reinstalling it. I can't do it anymore. The system keeps responding: "Unable to authenticate to the server. Username or password configuration may be incorrect." But they are all abolutely correct. I don't know what else to do. Any clue? Thanks

I just installed ESR 140, coming from 115 (Win7). A change I find very bothersome is that when I now search the calendar (All Events) the results return a separate entry for each occurrence of a recurring event instead of just the one definition of the recurring event. How do I make the search behave as it did previously? I have dozens of recurring events that recur weekly and have been using Thunderbird for over a decade... I am staring at hundreds of duplicate search results which also temporarily freezes the app while they load in. This is not a functional design.

Back in April I was hacked, on my 2012 Acer Desktop (WIndows 10) ,with a (RAT) remote access trojan, and the hacker screwed up my computer & changed my passwords. (Messed up my life bigtime--Creditcards, bank account, etc. I had Thunderbird and don't want to lose my e-mails. I finally got another laptop computer(Windows 11) & want to use Thunderbird there also. with same e-mail & password Just today I finally was able to get a new password for my ISP- windstream.net. How do I go about getting my password changed as I am unsure of what the hacker did. I really don't want to start over from scratch. My e-mail address is labman1@windstream.net. I don't really want to start a whole new account or entity. What do I do to go about changing the password? HELP !!!!

@

AI tells me I can't just drag my Gmail.com (IMAP) from local Folders to the internet-connected folders section, which contains my Verizon.com account hosted by AOL. How can move my Gmail (IMAP) account safely?

roland.multhaupt

18. Juni 2026, 07:13 GMT-6

Firebird is so slow now, that I can rarely receive the code that you send me. Have to take annother programm for that. Freezes even when trying to mark a mail or erasing it. WIN 11. The programm is working well at my wifes laptop also WIN 11. 2 month ago it worked fast and fine. Working in Troubleshooting mode does not show any spam ordner like before and it does not run better. I also downloaded the last version. No change! I would like to uninstall the programm but did not dare due to perhaps loose all my mails. Could you help me please? Thank you!

I recently updated windows and since then I have not been able to login to my emails and or recover contacts or calendar on thunderbird. I am able to login to my primary email but I have no contacts and am not able to login to my other 2 email accounts.

Greetings all!

Thunderbird version is 1.52.0

Since this morning (8:00 CET) I have to enter password for my google calendar every time I start Thunderbird. No matter what authentication options I choose, calendar manager keeps asking me to authenticate. "Don't ask again" is turned on. Gmail is set up as OAuth for both incoming and outgoing servers, and it works fine.

Things I've tried since:

- Removed legacy connection in password manager, when I was using IMAP to connect to Gmail - Revoked OAuth permission from google account for Calendar and from Thunderbird password manager - Unsubscribed from calendars and added them again after restarting Thunderbird

I don't know what more to do. Also, I don't know what happened, really, as it worked properly last night.

E-Mail messages are in Xfinity, but do not come to Mozilla Thunderbird. Not having access to Mozilla email, prevents messages to be sent from Xfinity. I also cannot send messages from web sites. brucelowrey@comcast.net

Other than being slow to download my emails now for a few months, TB was performing well until a week or so ago. Now it also won't open the downloaded email when I click on it and the TB freezes up so I can't close it out. I have tried restarting computer multiple times and it works for one or two emails that I can open and then starts freezing up again. Makes using it almost impossible. I have security Windows 11 Defender only and have had it the entire time when it also worked well.

Whereas on my other computers with the same account I can see all my Emails of years past, on my main computer suddenly and without any understandable reason only the mails of about the last four weeks are accessible and probably saved, be it in the default folder or a local one. I use Norton and Malwarebytes, but so i did already before the change took place. What can I do to reverse Thunderbird to its normal behaviour?

A weird thing has started happening to my Thunderbird inbox in the last couple of days. Emails are showing as from a totally different sender. For example, a Google search on Sondheim has been "sent" by EDF (my electricity supplier) and some Groupon emails are showing as coming from people I correspond with. Also a Keto bread recipe from a low carb group I belong to has been "sent" by one of my work clients! More weirdly, I copied them into a subfolder on my inbox and they then appeared correctly. I have tried repairing the folder but it made no difference.

I can sign in with my google account, but when I come to the installation window with Pop3 and SMTP another password is requested. I don't know which, and there's no possibilty to get a new. Please help Jens