Calendar Permission

Get-MailboxFolderPermission

https://docs.microsoft.com/en-us/powershell/module/exchange/get-mailboxfolderpermission?view=exchange-ps

Get

Get-MailboxFolderPermission john.smith:\calendar

Add

Add-MailboxFolderPermission john.smith:\calendar -user jane.smith -AccessRights Reviewer

Add-MailboxFolderPermission john.smith:\calendar -user jane.smith -AccessRights Editor

Remove

Remove-MailboxFolderPermission john.smith:\calendar -user jane.smith

john.smith giving access to his calendar to jane.smith. Using Mailbox alias.

Quick Note

Get-MailboxFolderPermission john.smith:\calendar

Remove-MailboxFolderPermission john.smith:\calendar -user jane.smith

Add-MailboxFolderPermission john.smith:\calendar -user jane.smith -AccessRights Reviewer

Add-MailboxFolderPermission john.smith:\calendar -user jane.smith -AccessRights Editor

Delegate permissions vs. Folder permissions

https://www.msoutlook.info/question/delegate-permissions-versus-folder-permissions

View Shared Subfolders in an Exchange Mailbox

https://www.slipstick.com/exchange/view-shared-subfolders-in-a-exchange-mailbox/#tools