Skype for Business Online is being retired in 2021

Microsoft announced the definite end of Skype for Business Online, which will occur in two years – July 31, 2021. Until then, it is recommended that companies switch to Teams, which is a replacement product. After the mentioned date, SBO will no longer be available.
The change does not apply to Skype Consumer and Skype for Business Server, which will continue to work.
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Microsoft is recognized as a leader in the Forrester Report for both ECM and cloud content management platforms

Forrester published reports for ECM Content Platforms and Cloud Content Platforms for Q3 2019, where Microsoft was ranked as the leader, see here:

ECM Content Platforms, Q3 2019: