We currently have users in our organization who go by an alias name when sending email externally. To their customers they have a different name than the name they are known by in the office. The problem is, when we switched from Notes/Domino to Outlook/Exchange, we seem to have lost the ability to modify the name that is displayed when sending mail externally (in Notes it was easy, we just modified the location document on the client machine). For example, we have an employee named "Jane Doe" who is known as "Sarah Smith" to her customers. We can configure her "Reply To" email address to use her alias name, but she appears as "Jane Doe firstname.lastname@example.org" when sending email externally. The Exchange/Active Directory display name is used in conjunction with the reply to address when an email sent to an outside domain is received. We've tried changing the name, but keeping the existing display name, but it didn't work. In the Global Address Book we still need these people to appear with their real name (and for mail sent internally we want to see the GAB name), but for mail sent to a remote domain we need them to appear with their alias name. Ideally we would like to be able to display the alias name along with the email address in the format "FirstName LastName email@example.com" , but we can live with a solution that just removes the name and only sends the email address that's our only option.