Please share exactly what instructions you followed, as there are many. THank you

I’ve followed the instructions on the Mozilla site: saved the thunderbird profile on my old computer and copied it in to the Thunderbird profile on the new computer.

I verified that the Thunderbird levels were the same. The only difference is the old computer had a 32 bit version the new computer a 64 bit version. Old computer was Windows 10 new computer is Windows11.

Puzzling. Here are the steps as I understand them. And, since the process relies 100% on the OS file management, all should be there.

https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer

here is the info in brief steps:

1. ensure thunderbird is NOT running on old machine
2. enter %appdata% in search window on task bar and press Enter key
3. this should open windows file explorer in Appdata\roaming folder
4. highlight the Thunderbird folder and copy to external media
5. ensure thunderbird is installed on second computer, started once and NOT running
6. enter %appdata% in search window on task bar and press Enter key
7. you should be in Appdata\roaming folder. DELETE the thunderbird folder there
8. now , paste your copied thunderbird folder there.

#   start thunderbird and all should be there 

BUT, if you still have your old profile, I think we can assist in copying them to new profile. If you post screenshot of the old profile folder that inicates the missing folders, we can offer steps to copy them. thank you

David,

 THAT WORKED!  Thank you so much for your help. Much appreciated. 

Alan

Always glad to help. You're very welcome. :)