ActiveSync to Sync iPhone with my Application

Would it be possible, to use ActiveSync on iPhone to sync Mail, Contact and Appointments with my Application? My application is developed with C#. Now, I thought, If I could implement something, that the iPhones can connect with ActiveSync to my Application and sync the contacts, mails and Appointments like开发者_开发技巧 the iPhone does with Exchange. Perhaps there are some samples?

to my knowledge ActiveSync exposes a set of APIs called RAPI.

you can google for this but I really wouldn't bet iPhone can be "forced" to work with ActiveSync (I can be wrong).