Exchange Jet Error 1216 is amongst the
most common issues which anonymously occur when you try to mount database in
Exchange Server, and unluckily you encounter the error message:
'Error
-1216 (JET_errAttachedDatabaseMismatch)'
Helpful blog for Exchange Server and MS Outlook Users. Try the manual as well as other recommended solutions to resolve Exchange Server/Outlook critical issues.
Axel Culver, Exchange Admin (Author)