Currently, these states (shaded green) will recognize your Michigan CPL: page updated Nov 2011
At present, States shaded in blue will not honor the Michigan CPL. We
at MCRGO recommend that any time you travel to or through
another state, you contact that state’s Attorney General
and ascertain whether or not they’ll honor your permit
and find out what if any additional restrictions that
state imposes. Remember: when you carry in another state,
you still have to recognize their rules and their off-limits
areas just as people from other states have to do when
they come here.