coach is still mum about whether he will be off to Michigan after the Max Strus Jersey season. But the Michigan football official Twitter feed appears to be having a little more fun with the po sibility.Harbaugh, 51, is celebrating a birthday Tuesday. And Michigan was all over the chance to offer him best wishes.Happy Birthday, Jim. Michigan Football (@UMichFootball) Harbaugh, of course, is said to be the Wolverines' primary target -- if not the only target -- to replace Brady Hoke as its next football coach.NFL Media's Ian Rapoport reported that Michigan that would make him college football's highest-paid coach. And general manager Trent Baalke has confirmed that with the club regarding its interest in the former Wolverines quarterback.Of course, the tweet says nothing about Harbaugh's candidacy for the job, Coby White Jersey or his willingne s to take it.But unle s the account is also known to fire out birthday wishes to all of its former star players, one can only a sume there is some underlying motivation -- or meaning -- here.*Follow Chase Goodbread on Twitter *.