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Exchange users in a different domain need access to email server

I have two domains that are not in the same forest at all (created before me).  Anyway, one domain is a Windows 2003 domain and has the Exchange 2003 server - domain abc.com.  Other domain was a Windows 2000 domain and was domain xyz.com  ALL users had email services at domain abc.com.  Users at xyz.com would connect through a vpn using a RAS server and connect to the exchange server.  All client were XP until recently I am trying to implement Windows 7.  We finally got rid of an outdated piece of software that kept me at Windows 2000 server and I upgraded them to Windows 2003 server so at least both domain are on Windows 2003 now but Windows 7 does not like the vpn and I cannot seem to get that client to connect to the exchange server.  I have created a two-way trust, it is a Realm trust that is not transitive.  What am I missing?  This should not be this hard although I am new to Windows 7 of course.  Thanks for any help.
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Lanee Kirby
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Lanee Kirby
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danielmarkoCommented:

I think you should upgrade to Exchange 2010 and then grant users permissions to the 2010 mailbox with

use Exchange shell command

Add-MailboxPermission -id {ABCusername} -AccessRights fullaccess -user "{xyzdomain\username}"

I would upgrade exchange first then roll out Windows 7.

What version of Outlook are you using to access the email?
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Lanee KirbyAuthor Commented:
I cannot do that in the amount of time that I have.  That is on my plan for later in the year.  Right now we are using Office Professional 2007, the most current version.  Currently the users at the other domain are using XP and connecting over the VPN and hitting the exchange server with no problem.  Don't know why Window 7 does not like the VPN.  It will connect over it but will not allow users to connect to exchange.  Any other thoughts considering my constraints at the moment?  Thanks!
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MegaNuk3Commented:
What error do the W7 machines get?
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Lanee KirbyAuthor Commented:
Sorry, I think I was misleading a little bit.  I can login to the domain XYZ.com and then I can connect to domain ABC.com using a newly created VPN and I am currently connected to both.  When I try to configure Outlook, just like we do with XP, using the same version of Outlook, the latest version, I configure it manually, and type in the IP address on the server and the User name and select “Check Name” and when I do it correctly resolves the user’s name and it resolves the IP address to the correct Exchange server (our only one) on the ABC.com domain.  Everything looks correct as if it is working fine.  I click next and Finish and once it tries to open Outlook for a few minutes or so and then it says it “cannot open the default email folders, you must connect to Microsoft Exchange with the current profile before you can synchronize your folders with your offline folder file.”  
However, with XP it connects all day long, no problem.
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MegaNuk3Commented:
What happens if you try a non cached profile?
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Lanee KirbyAuthor Commented:
I resolved this by adding a secondary dns zone for each domain and now the VPN is no longer needed.  Thanks!
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MegaNuk3Commented:
Thanks for the update. Feel free to close the question then.
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Lanee KirbyAuthor Commented:
I resolved it.
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