Exchange user domain name is locked in
Posted on 2014-10-01
We have an Exchange 2010 server, and we need to change a user's domain name from a company we acquired, to our own company domain. This user has been running with his old company domain of XX.com, and now we want to change him to show as ZZ.com. In spite of successfully changing the Primary SMTP address in the Exchange Console, when we resolve his name in Outlook 2010, he comes up as his old domain of XX.com. It seems like it's "embedded" somehow in the system somewhere.