MailEnable Professional Guide
Upgrading an existing web mail installation
Installation > Upgrading > Upgrading an existing web mail installation

If upgrading an existing version of MailEnable the installer will detect and provide upgrade options for the Web Mail interface. Selecting Upgrade will improve installation times and upgrade the necessary Web Mail files that contain fixes and updates. The alternative option is to perform a Repair/Reinstall where the installer will proceed to reset Web Mail IIS components, ASP.NET script mappings and apply the respective permission settings for Web Mail. The Repair/Reinstall option is only recommended if you are experiencing problems with the Web Mail or Web Administration interfaces.