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?
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.

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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
David11011Author Commented:
Thanks. that did it.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.