I got bad news for ya. I did some digging around and to my understanding Easysync is a modified version of
XTDNConnect PC which at this time does not have Windows Mobile 5 support. Even with the next release of the easysync 4.2.4 you will not see this support my sources tell me.
This is also sad news for me too, since I sync my x50v to my lotus notes.
I hear mNotes does provide Windows Mobile 5 support tho