If you connect and sync via activesync, instead of setting up a new partnership, choose GUEST, or hit cancel when it asks about the partnership. At that point you can browse the phone without actually syncing. I do this on my laptop all the time....

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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