Here is an article from Microsoft-Watch:

Microsoft is in an awkward position now that Red Hat has slammed the door shut on any possibility of entering into a patent protection deal similar to the one Redmond has with Novell.

While Microsoft has been telling anyone who will listen that it wants to enter into a similar patent indemnity arrangement with all the other Linux vendors, and is hopeful this will be achieveable with Red Hat, it appears that is not going to happen.

It goes on to talk about how MS may indemnify RedHat customers on its own... FROM WHAT?