In Office 365 Managers get Notifications of User deletions as well as access to the users OneDrive

When an office 365 account is deleted or the Ad Sync Item is removed ( Either by deleting the object or removing the AD Sync group from the user ) it has 30 days before it gets deleted ( Emails and Files )

The manager get notified of this at 30 days , then again at 7 days

https://docs.microsoft.com/en-us/onedrive/retention-and-deletion

Creation of a Team Calendar

Outlook will automatically add Team Members ( who have the same Manager ) calendars to each outlook, as well as the managers

Expand : User Configuration – Policies – Administrative Templates – Microsoft Outlook 2010 or/and 2013 or 2016– Outlook Options – Preferences – Calendar Options – Schedule View

And Set policy Prevent Reporting Line Group Calendar from appearing .