27 Mar
2018
27 Mar
'18
4:08 p.m.
Not a total solution, just a shot in the dark. Is your Thunderbird configured to delete mail from your E-Mail provider on each update?
Yes.
perhaps your provider still has them stored, but Thunderbird sees them as "old" and won't download them again.
No, the problem is some kind of corruption and/or syncing locally between the profile and the application. I don't * think * the messages are actually gone, because I copied the whole profile -- I've done that before and it was never a problem. if they are truly gone then it's a major disaster for me. 10+ years and thousands of messages. Obviously most of them are probably just background noise, but some of them are vital to my life.