Skype allows users to communicate over the Internet by voice, using a microphone, by video using a webcam, and by instant messaging.
Skype-to-Skype calls to other users are free of charge, while calls to landline telephones and mobile phones (over traditional telephone networks) are charged via a debit-based user account system called Skype Credit.
Along with taking over development of existing Skype desktop and mobile apps, the company developed a dedicated client app for its newly released, touch-focused Windows 8 and Windows RT operating systems.
They were made available from Windows Store when the new OS launched on 26 October 2012.
agreed to acquire Luxembourg-based Skype Technologies SA for approximately USD2.5 billion in up-front cash and e Bay stock, plus potential performance-based consideration.
Shortly after its acquisition, Microsoft began integrating the Skype service with its own products.
But you definitely won't be able to distribute your application through App Store.
On 11 November 2014, Microsoft announced that in 2015, Lync would be replaced by Skype for Business.
Skype allows these registered users to communicate through both instant messaging and voice chat.
Voice chat allows telephone calls between pairs of users and conference calling and uses a proprietary audio codec.
Microsoft bought Skype in May 2011 for .5 billion.
Skype division headquarters are in Luxembourg, but most of the development team and 44% of all the division's employees are still situated in Tallinn and Tartu, Estonia.