My company owns 2 other companies, so all my users have multiple smtp addresses
in Exchange, for each different domain name. For example, email@example.com, firstname.lastname@example.org and email@example.com.
The mx records all point to my Exchange server, and email sent to any address works using Outlook 2007.
The problem is; with a single profile, you can't tell which address the mail was sent to, and replies always use
the primary smtp address. Outlook 2010 allows multiple exchange accounts, so I bought a copy, but it won't add
firstname.lastname@example.org as a 2nd account to user bob. I even deleted that smtp address from bob's account. Exchange
won't let me add a 2nd mailbox to an existing user, so how does this work? I want Bob's outlook to receive email
from all domain addresses, and use the "From" picker to choose which to reply from.