A Michigan trial court erred when it allowed the Thomas M. Cooley Law School to unmask an anonymous Internet critic, an intermediate state appeals court has ruled.

The decision by the Michigan Court of Appeals was the latest in the saga of the blogger known by the handle Rockstar05 and his former school — Cooley — which is suing him for defamation. It was a victory for Rockstar05, who now will have the opportunity to ask the trial court to dismiss the complaint against him.