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,