I just stepped into a role where there are multiple sites and the primary site has been transition to Exchange 2010 but the Exchange 2003 servers are still in place. It's been years since I have dealt with E2k3 and the person who started the transition here is no longer with the company. Here are my questions:
How can I tell what, if any, roles are still on the Exchange 2003 servers?
When is it safe to shut down / uninstall the Exchange 2003 Mailbox servers?
Is there any tools out there that can look at your messaging environment and let you know what servers are safe to shut down?