A widely known Web site Cryptome has released information about backdooring Microsoft Windows machines today.
According to the post National Security Agency has access both stand-alone systems and networks running Microsoft products.
The post states the following:
"This includes wireless wiretapping of ?smart phones? running Microsoft Mobile.
Microsoft remote administrative privileges allow ?backdooring? into Microsoft operating systems via IP/TCP ports 1024 through 1030."
According to the Cryptome's source this is typically triggered when devices visit Microsoft Update servers.
Reference Link h3r3