I realize this thread is really old - but if anyone gets this far, and still can't get it to go, make sure you do a HARD reset on teh PDA. I struggled for hours trying to get the "serial port" service to change to "activesync" and nothing worked. As a hail mary, I did a hard reset, and when it came up, it worked first try. Been running solid since. I used the tutorial listed here:
http://axim.dpicts.com/ Everythign lined up, except I just couldn't get the BT services to change from serial port to activesync.
Good luck!