SKYPE FOR BUSINESS - IS GOING AWAY
While Skype for Business is an active and available tool, Microsoft has already transitioned it to the End of Life program: set to conclude on April 1st, 2020.  Microsoft has put a strong emphasis on Microsoft Teams as the default communications app for Office 365.  In fact, to kick off 2019: they successfully migrated 180,000 internal employees and vendors from Skype for Business to Teams.