Skype for Business
What is Skype for Business?
Skype for Business Online is a communications service that connects people for meetings and conversations anytime and from virtually anywhere. It gives users access to information about presence, and enables instant messaging, audio and video calling, rich online meetings, and extensive web conferencing capabilities.
Skype for Business is hosted on multi-tenant servers that support multiple customers simultaneously. These servers are housed in Microsoft data centers and are accessible to users on a wide range of devices from inside a corporate network or over the internet.Source: https://docs.microsoft.com/en-us/office365/servicedescriptions/skype-for-business-online-service-description/skype-for-business-online-service-description