The language for the systray and / or the ixi-UMS SMTP Client is determined during the installation and is valid for every user.
The display language can be changed later on in the Registry:
64-bit operating system:
32-bit operating system:
Possible Values: de, en
When the values are changed, the prnd.exe must be stopped in the task manager and must be restarted via the Auto start or by double-click on the prnd.exe.