Thank you for your post. It's great that some people are aware and don't forget; I am the same way. The sensible course of action after knowing what we know is to avoid Microsoft's product as much as possible.
For instance, before Microsoft purchased Skype, it used direct peer-to-peer connections. After the purchase, MS immediately set up its own servers and had all (unencrypted!) communication pass through them. That should have been a warning sign to anyone with a brain. I instantly stopped using Skype and haven't since; there are free open source software solutions that allow encrypted communication for anyone who doesn't want to be monitored. And lo and behold, my suspicions were well founded. Microsoft does indeed scan every text message you send via Skype (eg for email addresses and passwords), and they can listen in on every single chat and record it if they so desire, and the NSA has access to everything.
I'd say it's crossing into criminal negligence territory to conduct secret company talks using Skype. It is well known (and has been for decades, not just after PRISM) that American intelligence services are conducting large scale industrial espionage and are using the intel gained to give American companies a competitive advantage over foreign competitors.
That's what surveillance networks like ECHELON are really all about.
http://en.wikipedia.org/wiki/ECHELON
(I thought it launched for $450.) 
