How to find the size of mailboxes on Exchange Server
John P is trying to consolidate his Exchange 2000 servers and migrate to Exchange 2003. He's also looking at implementing a SAN for the consolidated mailboxes. I found this useful KB article which shows how you can programatically obtain the size of mailboxes by using scripts. I won't reproduce any of the scripts here as they're a bit scary for a platforms person like me, but they work for Exchange 5.5 and 2000, and can be written in VBScript, Visual Basic, Visual C and Visual C++.
So go ahead John, you've got all of the resources now - even the bits about the storage!