I am new to exchange 2007 - so this may or may not be a easy question.. I have 4 seperate domains and just setup exchange on a fifth domain.. Basically, I want to use all the AD users from the other 4 domains to populate my exchange user list.. So far, I have just created trusts between the servers - but I am stuck on how to get those users to authenticate using their current windows logon in the new exchange server or even how to populate the exchange users with the users form the other domains.. Any help would be appreciated! * side note - I will only be hosting 1 domain name (user@domain.com) - just want all the users accross multiple domains to use this one exchange server *

Hi, You create linked mailboxes for the users in the other domains: http://technet.microsoft.com/en-us/library/bb201680(EXCHG.80).aspx Leif

that seemed to work! ty