Microsoft announces that Skype for Business Online Plan 1 will be retired, effective August 1, 2018.
Current customers have many transition paths for their users to maintain Plan 1 functionality or higher, such as:
- Skype for Business Online Plan 2
- Office 365 Business, Business Essentials, Business Premium, F1, E1, E3, E5 (or Microsoft 365 Business, F1, E1, E3, E5).
Further information on the transition paths can be found here: https://docs.microsoft.com/en-us/partner-center/skype-retiring