[Lat]

Hurrah!

I believe I have found the fix to my problem of no internet / data connectivity via ActiveSync 4.5. This even works with the "Enable faster data synchronization" option checked in the USB to PC settings.

All that's required is a little registry fix on the PC with AS, as per my searching on XDA. I've attached it for the benefit of anybody that has the same problem.

Cheers all.