I owned a business in Missouri that I closed in October 2010. I filed a dissolution with the Secreatry of State. Now I find out that Yellow Book served the Sec of State with a lawsuit against my former company & they got a judgment against the company. Is this possible since the company was dissolved prior to the Sec of State accepting service?

A judgement against a non-existent company is likely unenforceable, but if you were the personal guarantor of the contract, as is often the case, Yellow Book could pursue you personally for the amount owed. You may be able to work through an attorney to successfully settle the debt. It is always best to settle before a suit is filed against you personally. You have more leverage before the suit is underway.