Skype for Business with Teams Collaboration

 Use this mode to introduce Teams in your environment while you continue to use your existing investment in Skype for Business. Leave Skype for Business unchanged for chat, calling, and meeting capabilities. Add Teams collaboration capabilities: Teams and channels. Access to files in Microsoft 365 or Office 365. Applications. Teams communications capabilities—private chat, calling, and scheduling meetings. Teams private chat, calling, and scheduling meetings are off by default in this mode. https://docs.microsoft.com/en-us/microsoftteams/teams-and-skypeforbusiness-coexistence-and-interoperability