Microsoft Skype for Business Basic gives you presence, instant messaging (IM), audio and video calls, online meetings, and sharing capabilities with the latest User Interface.. This is free download. For more information about features available in Skype for Business Basic in comparison to the Skype for Business client, please visit this page: Skype for Business client comparision chart  Note: This Skype for Business Basic MSI desktop client provides presence, instant messaging and conferencing features. If you are licensed for Office 365 ProPlus, Office 365 Enterprise E3 or Office 365 Enterprise E4, you are also licensed for the full Skype for Business Windows desktop client, which includes additional features including advanced telephony support, archiving & compliance features. Please download full Skype for Business Windows desktop client from the Office 365 Software portal following the steps in Install Skype for Business on your PC.