Quite often, an outdated Thunderbird version causes issues, and Thunderbird may freeze on Windows 11. First and foremost, users can fix the freezing or slow running issues by updating Thunderbird. Follow the steps listed below: When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a Tab menu on the Tab toolbar to help you switch between Tabs. Bug report about lost profile after Windows crashedThis bug report is confusing because it actually reports multiple bugs. Note that the author in comment #1 states the problem only occurs after either windows or the application crashes but is especially prevalent when the profile name is not "Default User" and in comment #6 states that the entire profile was intact (including prefs.js) . Somebody else in comment#12 traced their problem to a corrupted prefs.js file.

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If you cannot delete messages in Thunderbird, it may be caused by a corrupted trash folder. Also, sometimes Thunderbird may freeze when deleting messages - in this case, try relaunching the app. How to fix If GnuPG software has been correctly installed on your computer, the Enigmail migration Add-on will find it and import all public keys from GnuPG into Thunderbird one by one, without being affected by the above-mentioned sized limit. Thunderbird looks in the profiles.ini file to find what profiles you have and where they are. It won't ignore bad entries in that file. If you have only one profile that you care about and you can't recover it delete the profiles.ini file and then follow the instructions on how to move a profile by creating a new profile and copying the contents of the old one over it. Thunderbird will create a new good profiles.ini for you when it creates the new profile. Profiles.ini is stored in the Thunderbird directory above where your profiles are stored by default.

Just works

https://wiki.mozilla.org/Thunderbird:OpenPGP:Migration-From-Enigmail I have never used OpenPGP with Thunderbird before: How do I setup OpenPGP? This article was written for Thunderbird. For Firefox and SeaMonkey, see the article Recovering a missing profile with your private conversations. Thunderbird is open source. As part of the Mozilla family you can be confident we Thunderbird and Evolution use the same file format (called mbox) to store your mails, so its not difficult to import them manually. When using the Enigmail migration tool to migrate public keys to Thunderbird, it should detect keys that have already been signed by your personal key, and automatically mark the corresponding keys as accepted keys, so you don't need to start from scratch.

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Yes, in Thunderbird 91 and later it is possible to disable it per message, or disable encrypted subjects by default in account settings. https://wiki.mozilla.org/Thunderbird:OpenPGP#Debugging_.2F_Tracing Thunderbird was automatically upgraded to version 78, but I prefer to stay with Thunderbird 68 and Enigmail.Previous versions of Thunderbird (version 68 and before) had built-in S/MIME support, and it was possible to add OpenPGP support using the Enigmail add-on and GnuPG software. The Enigmail add-on is no longer available for Thunderbird 78 except to assist its former users with migrating to the built-in OpenPGP support or getting guidance how to restore their Enigmail “Junior Mode” user experience.

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Alternatively, you could try to use the Enigmail version 2.2.x migration Add-on for importing public keys into Thunderbird, even if you haven't used Enigmail before. Enigmail 2.1.x only works with Thunderbird 68 and older release versions, and provides the classic functionality. You should get a listing of key IDs that can be used to decrypt the message (encrypted with ... ID ...).

FOLLOW

Connect the same transfer device you have used before to copy your Thunderbird profile folder from the source computer. Just the Sieve-Plugin is not yet compatible with the new version, but seems like developer is already working on a fix. As a way of exporting your personal keys (also called private or secret keys), you could use a command from command prompt to export them to a file. To export keys managed by GnuPG, you could use the following command: If you don't want to install pEp software, you may attempt a manual migration to Thunderbird's new built-in OpenPGP feature. To do so, you must set the configuration that disabled the previous Junior Mode.