I wouldn't consider Skype secure when all traffic for Skype goes through private servers run by Microsoft and there is as far as I am aware no end to end encryp

I wouldn't consider Skype secure when all traffic for Skype goes through private servers run by Microsoft and there is as far as I am aware no end to end encryption between end users. Also, Skype's protocol and entire stack is entirely opaque and thus hasn't been nearly as checked for security issues as something like XMPP with SSL for example.