If you want to use the full experience of Microsoft Teams, except the Microsoft Teams license, the Exchange online license, SharePoint Online license and OneDrive for Business license are needed.
You can buy the suitable subscription for your organization. Different subscriptions can provide different features of Microsoft Teams.
For more details about Microsoft Teams service subscription, please refer to this article:
https://learn.microsoft.com/en-us/office365/servicedescriptions/teams-service-description.
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