According to handgunlaw.us, WI recognizes MI.
Quite a few states, actually. For the first go-round, Wisconsin got a great deal right with their concealed carry laws. Part of the lead-up came from two great state-level court decisions, Schultz
. Both are well worth taking the time to read.
I have to hand it to folks there. That was an uphill battle, and they handled every step deftly.