When Office 365 first came on the scene, it made its debut with Lync, which was the successor of Office Communicator. Lync was an online communicator that gave users the ability to instant message, see your contacts' online presence and share your presence, audio and video call, and transfer files, as well as hold online meetings where you could share screens, whiteboards, specific files, polls, and surveys.
In November 2014, Microsoft announced that Skype for Business would replace Lync. Skype for Business was a great improvement on connectivity and reliability. It was built on the backbone of Skype. Skype has been around for many years, has been used by people around the world, and has consistently been a reliable platform.
