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This evening, Thunderbird has updated to the new version (can't see where the version number is held, unfortunately). Whenever I try to download new emails, I now get the message "Error with account [email address]. Sending of username did not succeed. Mail server pop3.iomartcloud.com responded: Mate, the command must be one of CAPA, USER, PASS or QUIT." Mails are still accessible through the mail client on my phone and through webmail, just not through Thunderbird.

A few weeks ago after an automatic update I ended up having Thunderbird version 131.0.1 installed, I have no idea how this happened. On opening I get a message telling me I shouldn't be using a beta version and that I should revert to the latest general release version (128.4)

Today when I had some free time I downloaded 128.4 and installed it. On opening it it says that I can't use a profile file from a later version with the earlier version. Is there a way to recover from this WITHOUT having to set up the whole profile again from scratch.

Meanwhile I have done a system restore so I am back with 131.0.1 It has not given me any problems so far. Is there a new general release version imminent that will get me back on track?

I would appreciate any help I am not a computer expert, just a user, and find Thunderbird a very good email client.

David Gould

Suddenly, Thunderbird lost all emails. I think it happen after I used the "AddressBook". I deleted some duplicate entries from there.

Somebody suggested to check the Indox file c:\Users\trei\AppData\Roaming\Thunderbird\Profiles\j5akdx98.default\Mail\pop.GMail.com\Inbox

There I have found indeed that "X-Mozilla-Status" was 0000 instead of 0001. I closed TB, did a batch replace, deleted the msf files and indeed the emails were back. However soon after that they disappeared again. Now the status is correct (0001) but the messages still won't appear.

In a recent upgrade the Thunderbird UI changed and now very hard to read UI when viewing an individual message or attempting to write a new message. Background color and text color are identical or nearly so. I've attached how it looks.

I've played around with settings extensively to try and fix, but there is no setting that enables me to control the color of the UI itself.

I am currently running Thunderbird 128.0.1esr 64-bit on Pop!_OS 22.04 LTS (Ubuntu Linux)

After upgrade Thunderbird to Nebula Almost all themes have the problem or the error that they change the design when I click on compose new mail, for example. And this design is unfortunately almost illegible. What can I do?