View permission:
Get-MailboxFolderPermission username:\Calendar [change username to actual user]
User permission:
Set user 2 to be Editor to user 1's calendar:
Add-MailboxFolderPermission -Identity [email protected]:\calendar -user [email protected] -AccessRights Editor
Can change Calendar to Contact:
Add-MailboxFolderPermission -Identity [email protected]:\contacts -user [email protected] -AccessRights Editor
Remove permission:
Remove-MailboxFolderPermission -Identity [email protected]:\Calendar -User [email protected]