UPN Suffixe and Forest Trust (same domain name)

hi,

we have 2 domains : 1 old (let's call domainold.local) , 1 new (let's newdomain.local) forest trust between them. users migrating new domain.

we set alternative upn suffixe in newdomain (newdomain.local) using old domain name (domainold.local) to allow users logon it. note : users have new sam name in new domain.

but have declared trust same dns name (domainold.local) between 2 forests.

so question : can add alternative upn "domainold.local" in "newdomain.local" if have active trust "domainold.local" ? need sure adding upn not interfere trust or not block use of old domain accounts new domain.

 hope i'm clear enough :) thanks.

simple answer no, cause name collision. reason if users logging in while connected new domain old domain's account, authentication not passed through.

if dissolve trust, yes.

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ace fekay
mvp, mct, mcitp/ea, mcts windows 2008/r2 & exchange 2007, exchange 2010 ea, mcse & mcsa 2003/2000, mcsa messaging 2003
microsoft certified trainer
microsoft mvp - directory services
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