We are changing the default domain email name at one of our clients. I think I have run into a problem with that. I can go into exchange and set the new default domain name for all users as xyz.com and it was previously abc.com. tell it to make those changes to all users. That is easy but what about outlook 2007? I tried this on a test account and outlook is still sending out email messages as abc.com domain and not the new one of xyz.com. How can I change that automatically from the server? or am I going to have to change that at the user level within Outlook 2007?