That is only partially true. Microsoft actually released JScript.net, which was an implementation of the proposal on the .net platform. Later they changed strat

That is only partially true. Microsoft actually released JScript.net, which was an implementation of the proposal on the .net platform. Later they changed strategy and decided they didn't want to support the proposal, and JScript.net is not supported anymore. But the fact remains that MS has delivered the only other implementation of the (now rejected) proposal apart from ActionScript (AFAIK).