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Exchange 2003 on Server 2003 DC - Added Server 2008 R2 DC....

I have an Exchange 2003 SP2 server on Server 2003 that is a DC and DNS server. I have 3 domains and a few users use POP3 to get mail from outside my network which works fine. When they try to send mail from outside my network they can't authenticate.
This worked until I added a Server 2008 R2 DC to the network yesterday. The server 2k8 machine only has AD and DNS installed on it.
No issues with AD synchronization between them.
All other mail seems to be working fine.

Is there something in the authentication with Server 2k8 R2 that could be causing this to fail?

SOLUTION

Kevin Hays

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ASKER CERTIFIED SOLUTION

ljlkrl

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ljlkrl

ASKER

I read the link you posted again, and looking at the Exchange Supportability Matrix here: http://technet.microsoft.com/en-us/library/ff728623.aspx
I see no reason why running Exchange 2003 SP2 on a Server 2003 SP2 box with a forest and domain level of Server 2003, and a Server 2k8 r2 AD would be a problem.
The matrix says it is supported.

Kevin Hays

I have the opposite problem with iphone 3/4 with inside the domain. People can get their email from outside the domain, but if they are in they cannot. My clients are using 2003 and/or 2007 exchange also.

Good luck on the upgrade.

Kevin

ljlkrl

ASKER

No real solution to question answered. I found a work around for it.