That's a long daily commute going back and forth from Michigan and Massachusetts.  Was the client a part year resident of both states?

Yes, that is correct. 

It was a MI resident for the first part of the year and then it moved to MA

Did he move and is a part year resident in each state or is he a resident of one state and a non-resident of the other?

Start will filling out the bottom of the fed info worksheet with the 2 states information.

You'll have 2 different state returns to file, be sure to add them both in your state EF list on the fed info worksheet.

He was resident in MI for the first part of the year. Then moved to MA in the 2nd part of the year. So, part year resident in both states 

So you file in both states as part year residents.  Check out towards the bottom of the federal client information worksheet