First of all, you can check the online records through the State of Michigan to determine who the company reported as the officers. That may not seal the deal for you, but it would be a start. You may end up needing to hire an attorney to defend you, however. The online records can be found, here: http://www.dleg.state.mi.us/bcs_corp/sr_corp.asp
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You are facing a difficult legal issue, and I strongly advise you to go seek the advice of a licensed Michigan attorney who has been through these battles before.
State taxing authorities and the IRS can get very nasty in matters like this. Get a good local attorney to get out in front of this before the matter gets more complicated - and yes, it can get much more complicated. Sales tax can turn criminal very quickly for very little amounts of money. So this is not the type of thing you want to put you head in the sand over and believe that the authorities will figure it out. You need an attorney that specializes in both IRS and Michigan tax controversy.
You have no liability after 2003, but may need to provide information to the IRS and the State showing you were not an owner after 2003. The Federal 2004 1120S and State SBT tax returns will show that you were no longer a shareholder. You may have liability for 2003 for the trust fund portions of the payroll taxes (amounts withheld from employees) and for State sales tax liability as a responsible officer.
Respond promptly so assessments do not become final.