Seems Microsoft hasn't really released anything worth protecting via patent in quite a while. At risk of sounding flame baity, I humbly submit one simple question:
What would it help globally, if they were able to unilaterally enforce software patents?
The knee-jerk reaction is to think of all the licensing revenue and such, but we're used to thinking in that manner. We've been force fed this rhetoric for years, whether we agree to it in principal or not. Thinking more realistically, I don't believe a truly innovative company has much to gain by spending dollars and raw efforts with such nonsense. By the time anyone would be able to reverse engineer or copy such innovations, the market has often caught up or moved past what would be covered by the patent anyway.
I think it makes more sense to simply go back to striving to be the best, rather than the biggest in your field. I think Microsoft has forgotten how to do this, and they're starting to feel the pains of this "new" direction. Back when Chicago ...err.. Windows 95 came out, the entire world was squirming in their seat to get it. There was true innovation in there. When Windows Vista came out, we were collectively cautious and ultimately soured. Stark contrast if there ever was one.
I'm sure some of the world's top talent is employed by Microsoft, but aren't able to let their works shine due to the mechanics of the large slow moving corporate machine.