Why is all three in one and not a single patent violated, in point of fat Linux has already violated 136 of his own patents..
I kind of expected that given that they did not disclose any of the patents that the standard Linux distro supposedly infringes on. That meant they their patents were weak and they didn't want them invalidated, or they knew that the open source developers would immediately start working to make their products non-infringing. It's better for the dishonest to have the FUD threat hanging than to have the source of it corrected, thereby eliminating the FUD.
The problem is that Microsoft still plans to use the FUD threat to lure other unknowing or fearful companies into business deals. And all the while they'll keep those patent numbers in the dark, because light is the best disinfectant.