Furthermore, Microsoft discontinued two of its own products in favor of Skype: In a month-long transition period from 8 to 30 April 2013, Microsoft phased out its long-standing Windows Live Messenger instant messaging service in favor of Skype, although Messenger continued in mainland China.On 11 November 2014, Microsoft announced that in 2015, Lync would be replaced by Skype for Business.In September 2005, e Bay acquired Skype for .6 billion.
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.
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.
The latest version of the communication software combines features of Lync and the consumer Skype software.
There are two user interfaces – organizations can switch their users from the default Skype for Business interface to the Lync interface.