On July 31, 2021, the support of Skype for Business will expire as planned by Microsoft – as announced in 2019. From September 1, 2019 Microsoft will direct all new Office 365 customers to the teams. Microsoft is confident that Teams can fully replace Skype for Business Online for even the most demanding business customers. Skype for Home and the Skype for Business server will continue to operate beyond this date. MSPU has summarized some more details here.