I'm migrating from Exchange 2003 to Exchange 2010. There's a single Exchange 2003 server which isn't a domain controller, it's only running Exchange 2003. It has 100 mailboxes. The 2003 mailbox database folder size is around 22 GB.
I used the Exchange Storage Calculator and entered 150 mailboxes and a few other values and it suggested creating 4 mailbox databases. I've read several places which suggest using multiple mailbox databases but don't really explain why.
Does it matter how many mailbox databases I use? Should I use 4 or more or less? Why?
When I performed a test mail migration from 2003 > 2010 all of the migrated mailboxes end up in the first of the four mailbox databases I created i.e. MD01. Is that because there are only around 22 GB of files and there weren't enough files to be spread out among the 4 databases or do I need to do something special to perform a migration from 2003 > 4 mailbox databases in 2010 ?
Thanks in advance