I had the exact same error today after a computer crash. After the message it stated also that my Index file was corrupt and if I wanted to re-index, which I did. The crash cost me todays email but else all seems now fine, I did not come across any further errors as you describe.
Did you try launching PM in maintenance mode? Anyways, before fiddling any further with the database, I'd make a backup copy of what you have currently... just in case. ---marlyse ------------ former message(s) quotes: ------------- > I got this lovely message when starting PowerMail 5.5.3 this >afternoon. After clicking "OK", PowerMail starts up and the database >opens, seemingly without problems. > > I've been using 5.5.3 since it came out; no recent disk errors or crashes. > > I can't compact the database; PowerMail gives the same error and >wants to convert the database to PowerMail 5 format, but can't, of >course, since it's already in PowerMail 5 format. It gets an "unknown >error"; Class = Conv, what = 1, when = 0. > > I can rebuild, since the "Your database file has not the expected >format" error comes up. > > Has anybody seen and fixed this error before? > > > >Brian > >