First I'll summarize my hardware/software details:
MacBook Pro 2GHZ running OSX10.4.8
Parallels (Build 3120 RC) running XP Pro.
Polar Precision Perf SW (ver 4.03.044)
Steps I took:
1. Loaded Polar Precision SW in WinXP and updated to latest version, shutdown Parallels.
2. Copied Polar IrDA 3" software disk to full size disk for use in MMP slot drive.
3. In OSX installed the SigmaTelUSBIrDA.pkg found on the Mac_Driver.dmg image on Polar IrDA software disk. Plugged in device and verified listed in Mac System Profiler under hardware/USB/USB High Speed Bus. (Listed as STIr42xx).
4. Read IR721 Windows OS Manual V1.0.1638.doc on disk for instructions for loading the drivers in windows.
5. Ejected Software disk, removed IrDA device, and started Parallels and WinXP.
6. Inserted disk, installer auto starts. Follow prompts and install IrDA drivers in Windows.
7. Inserted Polar IrDA device and windows prompted again for new hardware device found. Follow the prompts and install device again via the CD. From this point on Windows should recognize device whenever it's plugged in.
8. Started Polar Precision Software and interfaced with my Polar S625X without problems.
(Note: According to Polar IrDA USB device packaging, it is not compatible with S610, 710, 810 or E600)