Comment BlueJ, Star Trek and Microsoft lawyers (Score 1) 84
That, in fact, is the Microsoft strategy. There was a funny spoof years back, sort of a take off on Star Trek in which the enemy ship (Microsoft) prepares to attack. They don't deploy a photon blaster, rather the pod doors open, and a column of suits (replete with brief cases) emerges - oh no! - lawyers!
But at least in one case, very similar to Blackboard's situation (with prior art), Microsoft actually did the right thing. In their new version of Visual Studio, they had something called "Object Bench", and BlueJ developer, at first interested to see what Microsoft was doing, after exploring the screens a bit, realized it was very similar to BlueJ - a little _too_ similar, in fact! Worse, they were filing a patent!
Fortunately, MSFT has since apologized.