we have some strange behaviour of our notes clients when archiving the mail database.
archiving is configured to moving all docs older than 365 days to a local archive db. (no policy) when archiving is started, the client doesn’t respond anymore. and when you interupt whith ctr-pause, the mail-db can’t be accessed anymore until a server restart. 
i’ve allready checked the acl of the DBs. what else could it be??
Domino 6.0.2CF1
Notes 6.0.2CF1, 6.5, 6.5.1