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JenniferFlag for United States of America

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Exchange 2007 Upgrade to Exchange 2010

I recently upgraded our exchange from 2007. I put exchange 2010 on a new server, I moved all mailboxes to the new server. I have the internal and external settings in all of the services. I have my SSL certificate installed as well as a self-signed certificate. I am ready to decommission the old server. I still have one problem though.
My active sync users can no longer connect. I have tried to do an Exchange connection multiple ways. With the iphones it just hangs on 'verifying' or with the androids it just keeps trying to 'sync'. I am running out of things to try, I have researched and researched.

Does anyone know how to fix this?
Does having both servers still coexisting have anything to do with it?
What do I need to do to completely get rid of the old servers in the domain? (Looks like there is reminisce of an old EX 2003 server as well)
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Adam Brown
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Goto Exrca.com and run the activesync test, that will tell you where is the issue.
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I had to go away from this for awhile. I apologize. I never could get it to work on mobile phones. In testing the activesync it was working for most of the test. I will have to test again and post back.
I completely removed the old server from the network for other reasons. I have also since had to make some DNS changes and exchange server changes. I can't say that any of the comments above fixed it but I did look into each of those so I am giving a multiple point solution.