And this is the only warning about infection you have there?
If yes, it's really strange. In this case, the virus was correctly detected
inside of the mailbox, in a particular message (that's the part following the
Inbox part) - not in the Inbox file itself (it would be the end of the path in that case). So, it should have been deleted correctly, without corrupting/deleting the mailbox...
I guess you have overwritten the Inbox file already, did you? I wish we could find out what went wrong...