If this is voicemail only server the first issue would be why the mailbox is large enough for you to have to reduce it. By default Exchange should delete any deleted messages from the Exchange store in Exchange 2000 immideately (0 days) and only keep deleted mailboxes for 30 days before purging them. If mailboxes are large, then there is an issue with Exchange not doing any maintenance on the server. If this is the case, to reduce the size of someone's mailbox on a vmail only system is to get into their mailbox via OWA (Outlook Web Access) and actually manually delete what you need (usually deleted items). To get into their mailbox via OWA do the following on the server.
Open Internet Explorer and go to this url..
HTTP://localhost/exchange/username
or
HTTP://servername/exchange/username
The username should be the alias of the account of interest in this case.
It will ask you for a username/password. Enter that user's alias for the username and their password. If you don't know their password, and since this is a vmail system, you can change it to whatever you need in Active Directory. Once you login, it will present you with OWA to their mailbox. It will look similar to Outlook 2000 interface on a user's machine. Choose the folders option in the left pane so you can see what's in the inbox and deleted items folders. Chances are their deleted items are not getting purged. Delete all their deleted items to reduce the size. Do this for all the users that have the largest accounts in Exchange System Manager first and this should clear a ton of space quickly. I hope this helps your situation.
Tray
