Conviction of a DUI or DWI can lead to many things such as suspension or revocation of your license as well as higher insurance rates. One of the other things that it can lead to is the requirement of having a SR-22 insurance. What does the SR-22 insurance do? It is a statement of proof of your financial obligation to the State due to a DUI. Since you are considered a higher risk driver, the State needs the SR-22 insurance policy in order to make sure that in case something else happened you would be able to pay for it. The SR-22 policy lasts around 3 years and if you have a lapse in coverage or the policy is prematurely ended then the State will be notified and your license suspended.
If you live in Michigan then you will have to abide by the laws set by the State of Michigan. Michigan is a no fault State meaning that each persons insurance company pays for all damage, medical expenses regardless of who was at fault. This can complicate the issue of SR22 a bit but the bottom line is that SR22 policy is required in Michigan if you were convicted of a DUI or DWI in Michigan. The policy is required for around 3 years but it can vary.
Contact the insurance company you are with right now to see if they provide SR22 coverage. However, there are brokers and agents who specialize in Michigan SR22 insurance and they might be able to give you a better deal. It is best to shop around and find out the best value. If you move out of Michigan then you would need to carry your SR22 over to the new State. As of now only New York and North Carolina are the only States that do not require SR22 coverage at all. Contact your local insurance provider and Motor Vehicle department if you have any questions.