Changing primary SMTP address

A user called in, and wanted to have a different address as their primary email address. After making the change, when I tried to apply it, I encountered the following error message:

The root cause is a default setting in Exchange, applying an e-mail address policy. Here’s how to resolve the problem:

1. In the properties Window, go to the E-mail tab
2. At the bottom, uncheck “Automatically update e-mail addresses based on recipient policy”
   
3. Hit apply

That should do it.