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Problem Adding Exchange 2007 CAS on 2003 server with 2008 dc's

Hi,
I  have a working production environment with Windows 2008 DC's, Exchange 2007 servers also on 2008 Servers.  I'm wanting to add another CAS server to try to help with an OWA problem, where I suspect IIS7 as being an issue.  I'm trying to install this CAS on a new Windows 2003 server so I can use IIS6.  The server is 2k3 R2 Enterprise x64, sp2.  As far as I know, I have met all of the prereqs.  During the install process, I get to the point where I choose to install the CAS role, then I get this error: "cannot find at least one global catalog server running windows server 2003 service pack 1 or later in the local active directory site."    My DC's are all GC's as well, I've verified in ADS&S and also in DNS.  2 of them are in the site where this new CAS box is, and the subnet is defined in ADS&S as being the same site.  My other existing Exchange boxes are in the same subnet and are working fine.  I've tried installing via the gui and also via command line, specifying the DC to use, but it still can't find a gc.  I know they're there, why can't I see them?  My dc's are 2008, do I really have to have a 2003 box as dc also?  That doesn't make sense...
Thanks in advance for your help!
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pwheat
Asked:
pwheat
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1 Solution
 
coolsport00Commented:
According to this article: http://technet.microsoft.com/en-us/library/aa996719.aspx , (see the GC and DC areas), you need a GC running 2K3 SP1 or LATER. So you should be good to go.

I'm not sure why, but maybe try running the:  Setup /PrepareLegacyExchangePermissions first then try it. (see: http://technet.microsoft.com/en-us/library/bb125239.aspx)

Regards.
~coolsport00
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pwheatAuthor Commented:
Yeah, I've read on several threads here and on MS that the "or later" would seem to be ok.  Let me ask this.  This is a new domain, and it's functional level is 2008, could this be causing a problem?
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coolsport00Commented:
Potentially, but I'm not overly familiar with 2K8. It wouldn't hurt to just go through the prep commands again to see if that resolves your issue. (http://technet.microsoft.com/en-us/library/bb125224.aspx)
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MesthaCommented:
Exchange 2007 doesn't have a problem with pure 2008 DCs, I have built a few sites with them now and have a working lab at home using them too.
I think it sounds like the machine is having problems seeing the domain controllers and as such I would simply drop it out of the domain wipe and rebuild it.

-M
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pwheatAuthor Commented:
I ended up having to build a new 2008 CAS to host this OWA separately, and everything worked fine.
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