There were two bugs that had to be fixed in Thunderbird before I could
upgrade. Both were related to downloading the newsgroup list from the
NNTP server. The first bug (fixed a few weeks ago) made the download
slow. The second bug truncated and corrupted the newsgroup list if it
encountered a newsgroup name with two consecutive dots in it.
Apparently there is more than one invalid name in the list!
And I had an older XPI tweak in my Thunderbird profile which caused some
conflicts with newer code. Mozilla advised me to build a new profile,
which necessitated copying over all my old folders and messages. That
was a bit tedious, but now I am current.
Kind regards,
--
https://www.arnoldtrembley.com/