Moved to Handheld PC 2000
If you have ActiveSync 4.x on your PC, then uninstalling it doesn't always remove all the files from the PC. Those tutorials deal with how to solve that problem, depending on what error message you are getting.
You cannot make the first connection to ActiveSync over a network - there already has to be an ActiveSync partnership with that Windows CE device, meaning you have to have already connected it before using serial, USB, infrared, or Bluetooth and then set up a partnership.