Skype is one of Microsoft's flagship products and it has been available as a desktop Win32 app and as a Modern/Metro/WinRT app for some time. You would think that Skype would support Universal Apps, there are few enough of them — but no. According to the Skype blog:
"Starting on July 7, we’re updating PC users of the Windows modern application to the Windows desktop application, and retiring the modern application."
Microsoft is pushing Windows 10 Universal Apps as the development platform for now and the future but its Skype team have just disagreed big time. What ever this is not a good example of dog fooding and puts in doubt any decision programmer might have made about being an early adopter of Windows 10 Universal Apps — if Microsoft can't get behind the plan why should developers?