Currently the lead article in The Guardian newspaper from UK is titled: "Revealed: how Microsoft handed the NSA access to encrypted messages?"

See...

http://www.guardian.co.uk/world/2013/jul/11/microsoft-nsa-collaboration-user-data

Sub-titled:
� Secret files show scale of Silicon Valley co-operation on Prism
� Outlook.com encryption unlocked even before official launch
� Skype worked to enable Prism collection of video calls
� Company says it is legally compelled to comply

While the article does not discuss the option of switching to Open Source Software, the comments section of the article contains quite a few posts discussing Linux and OSS as an alternative to Microsoft products.

Maybe these comments will help with boosting awareness of Open Source Software.