SMTP address in user's profile doesn't change when primary email address is changed in Exchange Server
Original KB number: 3040795
When a user's primary SMTP email address is changed in Microsoft Exchange Server 2013 or Exchange Server 2016, the address that's displayed in the user's profile in Microsoft Outlook does not change.
For example, assume that a user's primary SMTP email address is
email@example.com, as shown in Figure 1:
|Figure 1||Figure 2|
However, if the user's primary SMTP email address is changed to
firstname.lastname@example.org, the primary SMTP email address that's displayed in Outlook does not change as expected. You expect the primary SMTP email address in Outlook to reflect the change, as shown in Figure 2.
This issue is by design. The email address that's stamped in the root folder is determined at the time of profile creation and should reflect the primary SMTP address that's stamped on the user. The email address is strictly cosmetic and cannot be changed when the user's primary SMTP email address changes.
To work around this issue, delete and then re-create the profile for the user.
Learn how to Create an Outlook profile and set up an email account in Outlook.