Could somebody please explain how this new feature works?

I did try Message Notification in a Lotus Domino envirenment.

Here my settings:
Delivery Thereshold: 5
Enabled: true
Enabled: locked

I did register the user with a SMS Activation Message over SMTP. I think
this is a must, to use the feature above later. But Clients is disconnected
and I have cupple pendings on the Mobile Office Server. I am using a Windows
Mobile Device with WM 6.1.

Thanks in advance.