How to turn off Dataalarm on Lotus Notes Traveler for Windows Mobile 6.1 / Server 8.5.1

I’m working with Notes Traveler for Windows Mobile 6.1 on an HTC HD2 with Windows Movile 6.5.

Absolute nasty, that the sync always creates an Windows Mesage “Dataalarm” when i get a Mail. HTC does drop a Mailalert anyway when a Mail comes up - i have to handle this alart in addition which is quite nasty …

Does anybody knows a way to turn this Alarm off ?