When was the last time both Michigan and Michigan state were undefeated when they faced each other?

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1999 Nick Saban was coach and MSU pulled off the victory to go 6-0.
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When is the last time Michigan State has beat Michigan in football in Ann Arbor?

The last time Michigan State beat Michigan in football in Ann Arbor was 10/13/1990. The score of the game was 28-27. IM WRONG!!!!! Actually the last time msu has beaten