From what I read that means only if you can only open carry in a vehicle with a concealed carry permit.
http://www.legislature.mi.gov/documents/publications/firearms.pdf
28.425c License; form; authorized conduct.
Sec. 5c. (1) A license to carry a concealed pistol shall be in a form, with the same dimensions as a Michigan operator license,
prescribed by the department of state police. The license shall contain all of the following:
(a) The licensee’s full name and date of birth.
(b) A photograph and a physical description of the licensee.
(c) A statement of the effective dates of the license.
(d) An indication of exceptions authorized by this act applicable to the licensee.
(e) An indication whether the license is a duplicate.
(2) Subject to section 5o and except as otherwise provided by law, a license to carry a concealed pistol issued by the county
concealed weapon licensing board authorizes the licensee to do all of the following:
(a) Carry a pistol concealed on or about his or her person anywhere in this state.
(b) Carry a pistol in a vehicle, whether concealed or not concealed, anywhere in this state.
History: Add. 2000, Act 381, Eff. July 1, 2001;—Am. 2002, Act 719, Eff. July 1, 2003.
Popular name: CCW
Popular name: Concealed Weapons
Popular name: Right to Carry
Popular name: Shall Issue