Nice find, I'll check this out and see if it applies to Server 2008.
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Login using Alternative UPN suffix through external Trust
I have a resource domain and an account domain in a separate forest . The account domain has an alternative UPN suffix that corresponds to the users' email domain. I'd like users to be able to log into citrix and owa using their email address. Is it possible to log in to the resource domain (which has an external forest trust with the account domain) using the alternate UPN?
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by: henjoh09Posted on 2009-10-03 at 16:16:29ID: 25487492
When having external trust, you can only use implicit UPN, userID@AD-domain-dns.suffi
The alternate UPN is an explicit UPN string1@string2 that can only be used when having forest trust configured (forest functional level Windows Server 2003).
http://technet.microsoft.c