I tried installing communicator 2007 mobile on my HTC Tilt2 device. This device has Windows Mobile 6.5 - which should be compatible. However, when I synchronized the device, it was recognized as an incompatible device. As the version of Windows mobile complies with the stated technical requirements for the software, is there an issue of compatibility with the HTC branded device? I have MS Communicator 2007 R2 on my business laptop. My version of MS Office is 2003.