All Pocket PCs use ActiveSync which like the Windows Mobile OS, is made by Microsoft. So you won't need to do anything to use the replacement 2215. As long as you're using 3.1 you can sync to any Pocket PC, in fact. If you ever wish to download the latest version, you can do so for free from MS' site: www.pocketpc.com .
-------------------- Lisa Gade Editor in Chief, MobileTechReview