After doing some research, I found this page
http://www.softpanorama.org/Solaris/Security/solaris_rbac.shtml

It looks like PolicyKit is similar to Solaris RBAC (Role Based Access Control). That approved patent for Microsoft used for either Vista and Windows 7 is not original at all because it is just another implementation of RBAC (UAV in Microsoft word).

Should it be the case, then USPTO once again show their high degree of incompetence.

Remember when MS patented advertising embedded in an OS? MS sorted of tried that with an application (a version of MS Works 9 free with advertising outside of USA and most developed countries) by it seems to have not worked out well for them, when you consider that MS has now killed the Works project. Must not have had any real interest from the 3rd world which could pirate the real thing without advertisements, or generated any income for MS.

The only silver lining one can see here with MS patenting and infringing, is that maybe, MS will use this by default on Windows 8, and create a true limited account rather than the terrible half baked UAC with administrator as default. While there is just too many trojans out there, and the windows way of installing software is to get software from anywhere, still this might help a little as far as security. Anything that lessons the pain of windows users, is partially good, although MS has done it in a completely dishonest way, as usual.