ha! funny you posted this. i went through the same thought process and found the corrupt file. like you said, in outlook it looks fine. but when viewing through the "details" it shows up w/ nothing in the required fields. i deleted this one and all is good now
weird thing is i tried adding the same contact into outlook but it continues to show up as a bad file when trying to sync... weird.
no big though. i can live that... i'll just add the contact through the phone.