I upgraded ActiveSynch 3.8 to the version supplied on the CD by Telecom NZ (4.0.0 build 4538) because the Apache runs Windows Mobile 5 but... no go with the synching yet.
My Harrier synchs fine with AS 4, but the Apache doesn't show up as a device. That is, Windows XP discovers a Windows Mobile Device when you plug in the USB cable, but all that happens is that a new network connection is created, running at 10mbit/s. This stays in "acquiring network address" mode permanently, presumably as it waits for DHCP to assign an address (which doesn't doesn't make sense but...)
Have tried the troubleshooting tips at:
http://www.microsoft.com/windowsmobile/help/activesync/default.mspx
and I don't have a personal firewall installed on this box. No network optimiser or parental control thingies either :).
The Apache seems to be recognised OK as a Windows Mobile Device in Device Manager, but it doesn't show up in Explorer.
So... somewhere there's a conflict of some sort but neither ActiveSync nor WinXP provides any useful info about it.