Issue: you need to list the Last Logon Time of the mailboxes on Exchange 2003 in order to quickly find any old or unused mailboxes.
Solution: List the Last Logon Time per user using Exchange System Manager
1) Open Exchange System Manager (Start > All Programs > Microsoft Exchange > System Manager)
2) Expand Administrative Groups > First Administrative Group > Servers > SERVERNAME > First Storage Group > Mailbox Store > Mailboxes
Note: you may need to substitute your own Administrative Group name, Server name, Storage Group name and Mailbox Store name.
While you’re at it, I recommend reviewing the list of the largest mailboxes on your Exchange 2003 Server.
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