Hello Exchange Admins.Im having some troubles finding the right method of switching some emailaddresses on some users in several OU's.The case is that some users have a set of emailaddresses, a primary from domain_old.com and a secondary that is domain_new.com.The questionI have is to switch these addresses so that the new domain becomes primary and the secondary is the old one.What I have now is the followingGet-Mailbox -OrganizationalUnit "domain.ad"-resultsize unlimited | select Identity -expand emailaddresses| Where {$_.SMTPAddress -match "domain_old.com" -and $_.IsPrimaryAddress -eq $True} | %{get-mailbox $_.identity} | select identity -expand emailaddresses | where {$_.SMTPAddress -match "domain_new.com"} This gets me the exact list of all the affected mailboxes with these settings.Butfrom here tothe switching Iam at a loss.Any help is very much appriciated

Does this point you in the right direction?http://social.technet.microsoft.com/Forums/en/exchangesvradmin/thread/cbb0c830-cbe1-4200-90bd-c8946bceac22