The problem is that although Notes is a good program, it is not very popular except in some corporate networks, Outlook and MS programs are much much more popular ( and I'm a hardened Lotus user).
Activesync will not work with Notes, you will have to buy a 3rd party program such as mNotes. Find this here
http://www.commontime.com/
You can also use Easysync from IBM .
but whilst that is the good news, the bad new is that mNotes costs $70.