New Exchange server 2010 really slow

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?
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David11011Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
When doing the Exchange 2010 migration upgrade you also need to do a series of steps to ensure that 2003 is removed completely. If you have not transfered all of the exchagne features from 2003 to 2010 this could create issues if your 2003 server is powered off. It appears that there are still dependancies with Exchange 2003 as it is giving you issues while you have it powered off.

High level steps need to be done, see the link.

http://social.technet.microsoft.com/Forums/exchange/en-US/2e530650-ba65-447d-bd5d-cd9013ade1ee/decommission-exchange-2003-after-migration-to-exchange-2010

I would also check the routing on the Exchange 2010 server as the dependancy might be related to routing.

Check the Event Logs on the 2010 server aswell.
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David11011Author Commented:
Thanks. that did it.
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