Any suggestion?, Fresh install 6.5 or upgrde from 5.05 to 6.5 and convert the mail file ?
Subject: Upgrading Domino 5.05 to 6.5 ?
Installing 6.5 over 5 does work and it is recommended.
Please are aware of additional Notes server plugins, like Antivirus- and Backupsolutions (ready for 6.x?), of course also your applications should be checked first against 6.x.
IBMs RedBooks are a very good source, the upgrade guide is highly recommended.
MTH, Dirk