Got Office Onenot 2007,
Got HTC S710 with Mobile 6

I connect my phone to my pc, and activesync makes a connection.
I open Onenote, then functions -> Options -> Onenote mobile.
But the "install Onenote mobile" button is disabled (grayed out)
I have tried on my work pc with Window Vista Enterprise and on my privat pc
with Windows XP. I get the same on both.

Any suggestions?