Windows Phone is the ONLY smartphone that Skype do NOT run on. It NEVER manages to get it onto the Windows phones as an alternative. You can verify this at: http://www.skype.com/intl/en/get-skype/on-your-mobile/

In fact, Windows Phone is the ONLY smartphone that do NOT even sync with local Outlook as well.

Turning Windows 8 user interface into a phone/tablet interface is a huge mistake. It restrict multi-tasking of multiple windows.