The Friend of the Court for:

Investigating, modifying or enforcing a court order for custody, parenting time and support
Registering Michigan orders in other states
Providing alternative dispute resolution through mediation programs
Assistance in locating a parent
Any child support court case hearing or other related activity
Change of personal information for court case (to change legal address on court papers send the change of information form to your Friend of the Court).

The Michigan State Disbursement Unit (MiSDU) for:

Address change (for check payment or coupon mailings)
Questions on payment coupons
Questions about child support payments
Lost/stolen child support checks
IVR clarification/PIN resets

Bankruptcy (payer) impacts on enforcement of child support
  Letter to Michigan Bankruptcy Trustees
Passport denial/ Income tax refund offset program
Enforcement through recovery of financial assets
Referral service to the appropriate Friend of the Court or Support Specialist

To begin a child support case
To voluntarily establish paternity (how to add the name of the father to the birth certificate)

Questions on a case that is being handled by the Prosecuting Attorney