Microsoft Planner: According to Microsoft's official documentation, "Microsoft Planner is a simple, visual way to organize teamwork. You can create a plan, build a team, assign tasks, and update status... a Plan Board where you can organize tasks into buckets."
Source: Microsoft Corporation. (n.d.). Microsoft Planner help & learning. Microsoft Support.
Microsoft PowerPoint: Microsoft's documentation on collaboration states, "Work with others on a shared deck at the same time. With real-time co-authoring, you can see your co-authors' changes as they happen."
Source: Microsoft Corporation. (n.d.). Collaborate on PowerPoint presentations. Microsoft Support.
Microsoft Outlook: The calendar sharing functionality is a core feature described in official support materials: "You can share your calendar in Outlook with other people... Choose the calendar you want to share, click Calendar > Share Calendar."
Source: Microsoft Corporation. (n.d.). Share your calendar in Outlook on the web. Microsoft Support.
Microsoft OneDrive: Official documentation details how to manage access to shared files: "If you are the file owner... you can stop sharing the item... Select the file or folder you want to stop sharing... Select 'Manage access' in the upper-right corner... Click the X next to a link to disable it."
Source: Microsoft Corporation. (n.d.). Stop sharing OneDrive or SharePoint files or folders, or change permissions. Microsoft Support.