Skype, the Microsoft-owned service that popularized making calls over the internet, is hanging up for good. In May, Microsoft will shut down Skype, which it bought in 2011 for $8.5 billion in what at the time was the biggest acquisition in the tech titan’s history.

Microsoft is closing down Skype, the video-calling service it bought for $8.5 billion in 2011, which had helped spark a transformation in how people communicate online. The tech giant said Friday it will retire Skype in May and shift some of its services to Microsoft Teams,

Microsoft is pivoting to support Teams instead. Microsoft 365 head Jeff Teper encouraged Skype users to migrate their Skype contacts to Teams.