This forum page has a few different solutions:
http://discussions.apple.com/thread....readID=1151218

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Jocelyn Fiorello

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"virginia" wrote:

I have syncronised my iphone. When I try to look at the properties in my
address book in outlook I get the message "An invalid ENTRYID was passed in"
and I cant go any further to look at the contact what does thos mean?