Contents of all messages in Inbox get deleted randomly - but fortunately not contents of subfolders.
At random intervals - weeks apart - Thunderbird suddenly deletes all the contents of messages in my Inbox. The message headers remain - until I 'repair' the folder when the messages disappear completely. Messages in subfolders are OK.
Alla svar (4)
How many messages do you keep in your Inbox? The article here advises that the best way to minimise this problem is to keep it almost empty: http://kb.mozillazine.org/Keep_it_working_%28Thunderbird%29
I only keep ~10 messages in the Inbox - and the problem doesn't seem to be sensitive to the number of messages
pop account or imap? which AV software are you running?
POP account Antivirus is AVG (Free version)