OS Developers should...
I reckon that the open source developers and all of the other developers whose work Microsoft has infringed upon should setup a multi-billion dollar law-suit against Microsoft for their infringement on their IP works.
The number of standards that Microsoft has embraced and extended and ruined for their own purposes is pretty high and if all these people get together and threaten to sue them, Microsoft might just shut up about Linux infringing on MS IP works.
Infact, I would love to see what IP works MS is talking about.