Thunderbird Community Forum

I have resisted automatic update of Thunderbird using "check but notify me." For whatever reason on 11/27/2025 Thunderbird was updated to 115.10.1 and it was an unsatisfactory change. Two thing immediately got by attention: 1) the menu bar had been changed and all open tabs had been removed. And 2) I could not find anyway to customize views (see the uploaded image). After two days of fighting this change trying to re-enable custom views, I preserved my mail folders then uninstalled Thunderbird 64-bit and restored Thunderbird 32-bit from an image backup of C:\Program Files (x86)\Mozilla Thunderbird. That of-course required me to set up my profile again and copy the saved mail folders to the new profile directory tree.

I don't like automatic closing of tabs in 115.10.1 and for that alone would not upgrade beyond what I'm now running.

And I can't work without setting up custom views to show messages automatically sent by my UNIX client's nightly backup process. My default view is to "Filter Super User" as all automatic client backup reports come from the root (superuser) account.

The 115.10.1 had some type of filtering named "Quick View" (This is from my memory as I can't consult a running 115.10.1 installation) that is inadequate as it did not offer a way to save the views for later use (that I could find in my frantic state).

Just noticed that I have 2 folders named Sent. One of them is the Trash folder, which has a garbage can icon next to the word "Sent". When I click on properties of the folder it shows the name as Sent and the Location as mailbox://nobody@Local Folders/Trash. I clicked on Repair Folder and that didn't alter the name of the folder. The name "Sent" is read only.

You seem to have addressed this topic well but not simple enough for complete non-techies like me who can really only do "Click X, then right hand click Y, then click Z" etc. Is there a noddy solution I could try? Thanks. Derek

I've been able to drag emails from my old laptop to subfolders using IMAP. The folders are on the server and with my old laptop, I could drag emails from any account to any folder, regardless of which account it was created under. I started trying to do that with a new laptop and it won't let me drag the email. I have to go through the move > search for folder > select folder process. It's a pain in the butt, especially if I have a lot of emails I want to move. Since I could do it on my old laptop, I'm thinking it's some kind of setting that I have on one that I don't have on the other. I just can't figure out what I did differently on the new laptop that it won't let me drag and drop the emails where I want them.

There's a well known "window-focus bug" in MacOS 26, where clicking on a window (even the title bar) doesn’t bring that app to the front. It seems like Thunderbird is particularly susceptible to this bug, and I was kind of tolerating it in 26.1. But just today I updated to 26.2, and oddly this has made the problem worse. Is anybody else seeing this and is anybody aware of a fix? Various MacOS discussion groups recommend tweaking MacOS mission control settings, but I don't use mission control at all.

My computer crashed and so restarted it, when went to open thunderbird got a couldn't load XPCom message. Followed directions to reinstall thunderbird without using the uninstaller. When I installed it, I reloaded my email to set it up. I have lost all my latest emails, only getting them from 15 years ago. and today, nothing from this year. All my folders have also gone and my contacts.

Can someone please help, how do I fix it, I have emails from this year that I need to keep.

Ever since the latest update, Thunderbird (desktop) is extremely slow when connecting to imail.gmail.com. I frequently experience timeouts and authentication failures. This severely impedes my ability to send/receive email. I am running what I assume is the latest version of Windows 11 and have business class Internet with an ethernet connection. Please help!

After getting fed up with the Outlook app on windows. I decided to switch to TB. Now i can recieve my mails but can't send. I don't Use VPN and also checked if Windows Firewall is screwing things up. But those are allowed

Without the following. Unable to login to server (SMTP) smtp.office365.com with username *****@hotmail.com has failed (Translated from dutch)

These are my Settings incoming IMAP server: outlook.office365.com, 993, SSL/TLS, OAuth2 authentication, User Name = *****@hotmail.com outgoing SMTP server: smtp.office365.com, 587, STARTTLS, OAuth2 authentication, User Name = *****@hotmail.com

Nach Update auf Release Kanal kein Geburtstagskalender mehr und Geburtstage werden nicht im Kalender angezeigt. Geburtstage in Kontakten vorhanden. Benutze keine Cloud und kein Google. Wie werden Geburtstage wieder im Kalender angezeigt?

Starting 2026 Comcast is moving all email over to Yahoo email. We will be able to keep our Comcast email address, but as of this writing I do not know what suffix Yahoo will add to my 2 accounts. Both of my Comcast suffixes are Comcast.net and that is how my email comes through now. I was shared a linked that I didn't from Comcast about the pending change. Will the suffix change from Comcast.net? I have attached the link that was shared with me.

I guess with your Comcast e-mail, you need to know this. Comcast e-mail is going away and users are being switched over to Yahoo e-mail sometime in 2026.

Upgrade your Comcast.net email experience to Yahoo Mail

https://www.xfinity.com/support/articles/yahoo-email-migration-overview