Microsoft has announced today that support for the classic version of Skype 7.0 will end on September 1, 2018. Skype version 8.0 is the new version, and is available for Windows 7 & 8.1, Mac and Linux. Skype is a UWP (universal windows platform) app for Windows 10 in the Microsoft Store.
Updated mobile versions for iOS (iPhone and iPad) and Android are available to support this change as well and available from the Google App Store or Apple App Store.
Skype for Business is separate from this change and there are planned changes ahead for Skype for Business.
Information on the support change – https://blogs.skype.com/news/2018/07/16/upgrade-to-the-latest-version-of-skype-for-desktop/
System requirements for Skype 8.0 – https://support.skype.com/en/faq/FA10328/what-are-the-system-requirements-for-skype
Skype for all supported platforms can be downloaded from – https://www.skype.com/en/get-skype/
Updated 8/6/2018: Microsoft has delayed the end of life of Skype 7.x at this time no new end of life date has been set while Microsoft works to add features of Skype 7.x into the new Skype 8.0. https://answers.microsoft.com/en-us/skype/forum/skype_newsms/skype-7-skype-classic-to-be-discontinued-soon/28c3578a-128c-40eb-a99b-f3985c925176?messageId=ecf362c4-917d-4133-a33a-3572b2e39277
Updated 9/27/2018: Microsoft will end support for Skype 7.x on November 1, 2018 for Windows and Mac, and November 15, 2018 for mobile devices.