The Michigan Department of Corrections recommends using the Michigan State Police I-CHAT Criminal History Tool. The OTIS system ONLY shows records of people under the supervision of the Michigan Department of Corrections (MDOC).  Not everyone convicted of a felony is under MDOC supervision. The OTIS site is NOT appropriate for criminal background checks and DOES NOT contain an offender's complete criminal history (ex. jail time, crimes committed in other states, etc.)
For complete criminal history information you should use the Michigan State Police I-CHAT Site: http://www.michigan.gov/ichat