I got this for Christmas for use with a Cassiopeia E125. The software loaded fine, but the receiver did not appear to get a signal. The Ambicom office was closed during Christmas break, so I put it aside. This week I e-mailed Ambicom. Their response is as follows:"Unfortunately, the software is not compatible with PDA OS. It's only for Pocket PC 2002 and 2003. Sorry for this incovenient caused."Amazon's product description and the (sparse) Ambicom documentation did not reveal this detail. Now I'm stuck with something I probably can't use.