To tell you the truth I have no idea if this will work with WM2003, but it's worth a try. I have yet to finish reading all the information about this on MS's website, but I don't know whether they have mentioned anything restricting it to WM5, but once I know for sure, or if someone else knows, then we will find out.

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-Michael
Need help setting up your i730/i830 or other WM2003/WM5 Phone, as well as the other hacks I have done, check out the MRailing Guides and Links