Our company has been on Exchange 2003 up until yesterday when I installed an Exchange 2010 server on our network. I've got all the mailboxes moved over to the new server and everything is working fine.
The problem I'm having is that if I turn the old 2003 server off. It takes a long time to send or receive emails on the 2010 server. Like 30 minutes. When I turn the old email server back on everything works just fine.
Any ideas on what I messed up during the set up?