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Hi @Paul Thompson,
Please refer to this documentation for detailed guide:
Allow someone else to manage your mail and calendar
In short, as an end user, if he would like to share his calendar to others for management purpose, he can add others as his delegates and assign permissions in Outlook. (refer to the Make someone my delegate part)
Example (give user01 delegate access to calendar and assign Editor permission):
If the user wants to remove the delegate access, he can simply remove user01 from the box in the above screenshot.
As Exchange administrators, if you would like to manage delegate permissions for end users, you can use the Add-MailboxFolderPermission cmdlet in Exchange Powershell.
Example (adds Julia as a calendar delegate to Ayla's mailbox, but without access to private items.):
Add-MailboxFolderPermission -Identity ******@contoso.com:\Calendar -User ******@contoso.com -AccessRights Editor -SharingPermissionFlags Delegate
If you would like to remove the delegate access, use the Remove-MailboxFolderPermission cmdlet.
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