I recently upgraded from Exchange 2003 to 2007. I had an e-mail alias 'email@example.com' for an e-mail address 'firstname.lastname@example.org'. When an e-mail is sent to 'email@example.com', it automatically shows up as being sent to 'firstname.lastname@example.org'. Because of this, I can not create a rule in Outlook to move all e-mails sent to 'email@example.com' to a separate folder in the Inbox. In Exchange 2003, it did not automatically show up as being sent to 'firstname.lastname@example.org' and I was able to create a rule for e-mails sent to 'email@example.com'.