I doubt it. A company the size of Microsoft keeps a lot of attorneys on salary, and others on retainer. If Plurk pursues a lawsuit, then the smart thing for Microsoft would be to simply drive Plurk out of business in the courtroom, and then either buy them for nickels on the dollar, or release the product anyway as Plurk disintegrates.

If Plurk is hoping for a Microsoft-funded exit, this is probably not the way to go about it.