From what I've read they've said "we will not sue" (i.e. for patent infringement of people using these APIs and source code derived from it), but have only said that in relation to "non-commercial" uses. 

So bits of Linux is fine, but commercial companies like RedHat who utilise Linux will not be able to touch any of the developments off of this without MS jumping on them as usual.
From what I've read they've said "we will not sue" (i.e. for patent infringement of people using these APIs and source code derived from it), but have only said that in relation to "non-commercial" uses. 

So bits of Linux is fine, but commercial companies like RedHat who utilise Linux will not be able to touch any of the developments off of this without MS jumping on them as usual.