We have a Lotus Domino Server 5.02b/Windows NT 4 with SP 6 and 450 users that use the NotesKlient.
During nights the servers filesystem i backuped to tape with BackupExec.
Om monday a persons maildatabase was locked by another process and he was unable to read his mail. The message displayed in a frame that ought to show the new mail. I restarted the server and he was then able to see his mail.
On tuesdag the same problem occur, but with another person.