When using existing libraries, services, tools, and methods from outside Microsoft, we must be respectful of licenses, copyrights, and patents. Generally, you want to carefully research licenses and copyrights (your contact in Legal and Corporate Affairs can help), and never search, view, or speculate about patents. I was confused by this guidance till I wrote and reviewed one of my own patents. The legal claims section--the only section that counts--was indecipherable by anyone but a patent attorney. Ignorance is bliss and strongly recommended when it comes to patents.
Interesting advice from inside Microsoft. I wonder if Ballmer would agree that ignorance should be "strongly recommended when it comes to patents"?"