Source: http://arstechnica.com/security/2014/05 ... veillance/Encrypted or not, Skype communications prove “vital” to NSA surveillance
[...] "Now comes word that the National Security Agency is also able to work around Skype crypto—so much so that analysts have deemed the Microsoft-owned service "vital" to a key surveillance regimen known as PRISM.
"PRISM has a new collection capability: Skype stored communications," a previously confidential NSA memo from 2013 declared. "Skype stored communications will contain unique data which is not collected via normal real-time surveillance collection." The data includes buddy lists, credit card information, call records, user account data, and "other material" that is of value to the NSA's special source operations."
I also recommend those of you who read this check out this thread where we have listed a few alternatives to Skype: