If you need to reinstall Mail Express on the same computer, you can do so using the Mail Express Setup Wizard. (Reinstalling Mail Express updates only the Mail Express Server files; it does not affect the database files or the Add-in.)
To repair Mail Express
Execute the installer on the Mail Express Server computer. The Welcome page appears.
Click Next. The License Agreement appears.
Click I agree. The installer detects that Mail Express Server is already installed.
Click Reinstall Mail Express then click Reinstall.
If the Mail Express Server service is running, a message appears asking you to stop the service. Click Yes to continue installation. (If you click No, the installation aborts.)
If the Mail Express Server service is not running, the Mail Express Server files are installed.