Cannot connect to Exchange 2007 with Mac OSX 10.6 client running Outlook or Entourage

I have a network with currently 5 servers:

3 Windows 2008 Servers
2 Windows 2003 Servers

2 2008 Servers are domain controllers but, up until today, one of the 2003 servers was the PDC (for lack of a better term, it held all the FSMO roles).  This server was also running Exchange 2003 which we have since migrated to Exchange 2007 running on a Server 2008 box. I was in this morning to begin the process of transferring all of the FSMO roles to the newest 2008 server so we can retire the old 2003 box.

I upgraded the AD to the newest, transferred all 5 FSMO roles to the new server as well as DNS and DHCP and waited for replication to complete.

I then shut down the old 2003 server to test logins to the network.  Everything from the windows client side was clean and snappy.  Drives mapped, printers worked, Outlook connected to Exchange.  No issues with ANY Windows OS through XP , Vista and Windows 7.

The Macs however seem to have limited ability to connect to the network while the old DC is turned off.  The login is EXTREMELY slow and mapped drives eventually function.  They cannot connect to the Exchange Server at all. When I power the old server back up, the Macs can get back onto the network and all is well.  I have tried unbinding a Mac from the domain and rebinding to the new domain controller.  That process works fine but when I shut down the old DC again, the Mac is sluggish in the logon and still cannot connect to Exchange.

Any help of what I may be overlooking would be appreciated.

InterFACTAsked:
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MiniDevoConnect With a Mentor Commented:
It sounds like the Macs aren't connecting to the new AD at all, but are instead using cached credentials. Ensure you've got the active directory set up correctly;
http://www.techrepublic.com/article/solutionbase-connect-your-macs-to-windows-small-business-server/161636

Also, ensure that the windows server can 'see' the Macs.
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Justin YeungSenior Systems EngineerCommented:
did you ever specified the IP address of logon domain under the Mac?

i
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InterFACTAuthor Commented:
yes, we used the IP of the DC to bind to the domain in Network Account Server on the macs.

thanks
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Justin YeungSenior Systems EngineerCommented:
used netstat  under network ulitity and see where is it looking for LDAP connection.

see what ip it is trying to get to.
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InterFACTAuthor Commented:
the LDAP connection is looking for the old server.  is there a way to force it to the new server IP?  

thanks in advance!
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Justin YeungSenior Systems EngineerCommented:
directory utility --> advanced option--> administrative --> preferred server --> ip number for you dc
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InterFACTAuthor Commented:
Thanks Justin.  I will look at this on the weekend and hopefully it fixes my issue.
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InterFACTAuthor Commented:
specifying a prefered server did not resolve the issue.  I still get disconnected from outlook/entourage and the smb share script takes 8 minutes rather then less than one minute when the old server is power down.  I wonder if it has anything to do with digitally signing on the new windows server 2008 servers?
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Justin YeungSenior Systems EngineerCommented:
on directory utiltiy under Active directory domain, it should come up with your joined domain name.

however if you ping that name what ip is it resolved?

if it is not resolved correctly make sure you have the correct A record under dns
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InterFACTConnect With a Mentor Author Commented:
This turned out to be an invalid old entry in the user keychain.  Deleted that entry and all is well.
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InterFACTAuthor Commented:
The comment from MiniDevo got us looking in the right direction otherwise we were stumped.
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