Citat:
As we look ahead to the future, we‘re focusing our efforts on bringing the latest and greatest to the most recent versions of Skype. As a result, we are going to retire older versions of Skype for Windows desktop (6.13 and below) as well as Skype for Mac (6.14 and below) over the next few months.
blogs.skype.com/2014/06/20/making-way-for-the-next-generation-of-skype-on-desktop/