SDHC cards don't work on my MDA, which uses Windows 5, and there isn't a patch to make them work. Therefore, I cannot imagine them working on Windows 2003, which is an older and more primative version of Windows CE.

I BELIEVE the SDHCs can work with Windows 6, but I haven't tried it as I don't have a W6 device--I THINK you still need a patch for that.

SDHC devices don't work with a lot of SD adapters on PCs, but the SanDisk MobileMate SD+, Model SDDR-103 will--it works with SD, Mini-SD, TransFlash and several others--and the SDHC versions work, too, with XP-Pro SP2.