When your tabs are up you have to turn in your plate and get either a white with blue letter plate or a new one with the Mackinac bridge on it. I refuse to get the white plate when my tabs come due, I'll pay the extra money for the green one with the bridge.
At least this is what I'm being told, just the thought of spending any amount at the SOS makes me want to kill myself.
And with the Sky, the Redlines have been our around here since September of last year. We get all the GM cars a lot earlier then the rest of the country because I think we are the only ones who buy them. Also as long as it was licensed before Dec 31, 2006 it can keep the blue plate until it's time to re up it. It's pretty stupid and has just created a hassle for everyone.