VB script that discovers all mailboxes within the domain and updates the User Principal Name (UPN) to be the same as the email address.
- Launch the command prompt (cmd.exe).
- Download the following script: Set-Exchange2003UserPrincipalNameAsEmailAddress.zip.
- Run the script on a computer that is joined to the domain on which you want to update the user accounts.
When the script is done executing, you will see a confirmation dialog. You should then verify that the UPN has been updated with the same value as the email address of the user.