Skype for Business
Instant messaging software. It supports text, audio, and video chat.
Skype for Business is an enterprise software application for instant messaging and videotelephony.
CSP Perpetual Program - A single, upfront payment is made for perpetual ownership of the license. No Software Assurance is available to purchase, and no SA benefits are included as part of the license rights. All use rights are detailed in the Product Terms document.