Bought my T-Mobile phone three months ago and could not have been happier, talk about a nice way to manage my life! Till XP SP2 arrived. I have lost my Active Sync connection to the phone and nothing seems to help! It just will not connect.
OTOH it could be something misconfigured in the Windows Firewall. Try disabling that first. But I think that SP2 is hard on server software (such as Activesync) in general.
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Pete Henry
T-Mobile PocketPC Phone Edition