Late yesterday, FamilySearch.org made another update its Michigan, Probate Records, 1797-1973 collection.
As of today, 67 of the 83 counties are represented in some manner in the collection. Unfortunately, I did not make a count of the counties at the last update back in December 2014 in order to tell you if any new counties have been added or if it is just more images.
Remember each county varies in what is
available. This collection is also not indexed so you need to manually search it like "digital microfilm." Where possible, start with the index books. Use the FamilySearch catalog to determine what records were
microfilmed for the county you are dealing with and to figure out if
more digital images are likely to be added later.
And remember these records are free.
See you soon at the Mt. Clemens Public Library!