I have recently moved almost all of my users from an Exchange 2003 server to our new Exchange 2007 server. I back up the Exchange store every day with Windows Backup. The size of the backup file from the Exchange 2003 server has not gotten any smaller, even though the server went from around 50 active mailboxes to just 6.
When I go to the First Storage Group, I see only the 6 or so mailboxes left on the Exchange 2003 server.
Is there a command to compact the database? Am I doing something wrong when I move the mailboxes?