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I use Thunderbird 140.0esr (64 bit) under Windows 11. In recent days I can usually not move or copy an email message between folders, though occasionally a move succeeds for no obvious reason. For instance, I right-click an email in my Inbox and ask to move it to folder abc. It disappears from Inbox but does not show up in abc. If I look for it in All Mail it's there, but I cannot move or copy it to abc from there either. Usually I get no error message, but today I got one saying I should check my write privileges and disc space. I searched on a browser for write privileges and found information about Windows but nothing about Thunderbird. I have adequate disc space. This problem only appeared on about 29 July 2025; before then, moving and copying worked reliably both by right-clicking and by drag-and-drop.

Owing to a price rise in MS Office, I had been looking to move to free software. Unfortunately for email this isn't working. I have downloaded Thunderbird and have tried to transfer my Outlook data there. I started two weeks ago and on average believe the process has been running a few hours a day, for much of the time when I look occupying 0% of CPU capacity, and most of the time not rising above 1%. The import has been stuck at 33% for that time, which I assume means that it imported Accounts and Settings or Address Books quickly and is taking a very long time to import Mail Messages. (It imported the couple of month's worth on webmail quite quickly.) Likely this is owing to the size of the Outlook file, 5 GB. Does this essentially make the transfer impossible? For how large a file could Thunderbird do a successful import?

When I open "New Message," the form shows "No Subject" and will not let me enter a subject. Also, I have trouble using the cursor to go back to correct/change a word. I have to use the arrow keys to move around the message. I'm using Windows 10.

Emails appear correctly as delivered in Inbox pane, and can be opened, however when deleted the email disappears from the right side viewing pane but not from the Inbox pane. This leads to the next email being displayed in the right pane but the deleted email header remains higlighted in the left Inbox pane as if it was that email being displayed. This behaviour persists even in Troubleshooter mode. Troubleshooter mode did not start smoothly, telling me that Thunderbird was still running and required closing. I have reinstalled Thunderbird and the above behavour persists. The bahviour persists on my laptop only, not on a desktop with the same profile. The behaviour is quite disorientating, as emails that have been deleted continue to show up inthe Inbox pane unconnected to the email being displayed. One or two incorrect deletions have therefore occured. Picture below attached - the INOV8 email has been deleted. The next email appears in the right pane but the INOV8 email remains in the left inbox pane. When this eventually updates the inbox pane and display pane can be several email out of synch. Any suggestions?

I am trying to save a template and TB (141.00) keeps saving it in the 'Local Folders' template subfolder. I found this archived thread about this issue: https://support.mozilla.org/km/questions/1420516

I have changed the target folder to the appropriate account subfolder, closed/restarted TB, and this behavior persists. Anybody got a solution?

Hi,

I am trying to setup my email on Thunderbird android but auto configuration is not working it is however working fine on desktop. It is my own domain email and I have set up the DNS settings correctly following the below guides.

https://www.axigen.com/documentation/dns-configuration-p60719104 https://www.axigen.com/documentation/dns-based-service-discovery-p47120690 https://www.axigen.com/documentation/axigen-auto-discovery-p49119962 https://wiki.mozilla.org/Thunderbird:Autoconfiguration https://rseichter.github.io/automx2/#muaconf

Any help on this is much appreciated.

Thanks, Mat

Running Thunderbird 128.8.1esr on my Kubuntu 24.04 desktop. The server is at Fastmail. Beginning a few months ago, the Trash folder on the desktop no longer shows any messages. I can still see the messages in Trash by logging into Fastmail. Also, if I search the Trash folder from my desktop, I see the messages yielded by the search. I did try "repair folder", and rebuilt the msf file, with no result. So I have been waiting to see whether the problem will fix itself. As it hasn't I figured I would seek help here. Any suggestions for how to fix this?

What fresh hell is this (in the image)? The display is like this most of the time. Usually, highlighting text causes that part to be fixed but it doesn't last long. This in on Windows 11 and nothing seems to fix it. I've updated drivers and Thunderbird. I've scanned for system file damage. While there wer some corrupt files, fixing them has not affected the display problem. No effect. It looks like some characters are randomly changed to the background color. AMD integrated graphics on a Ryzen 9 7900x and Asrock X670E PG Lightning mainboard.