I have a Exchange 2010 set up. Our company was bought out. They want to change the email addresses to reflect. We already have My.Name@mycompanyone.com but want it changed to My.Name@mycompany.com. I see in Organization Configuration, Hub Transport, E-Mail Address Policies that there is an ability to ADD an address. I highlight the current policy and click edit, next, next. Will that add the new address to the existing addresses or will it only effect new mailboxes? If it will tattoo all the addresses can I make the new address the primary address here?