Office365 Calendar Permissions through PowerShell

Recently I’ve been asked by a few people in my office around permissions for calendars in Office365 and PowerShell commands to manage these.

Most places and sites list how to add and remove permissions but few mention how to edit / modify existing permissions on the calendars.

In the below example we will grant Bob, Author rights on Arweth’s calendar.

Add-MailboxFolderPermission [email protected]:\Calendar -User [email protected] -AccessRights Author

This is straight forward however if you want to edit the above permission or change the level of access you need to use the following command:

Set-MailboxFolderPermission [email protected]:\Calendar -User [email protected] -AccessRights Editor

If you attempted to use the add-mailboxfolderpermission command again Office365 would have returned an error similar to:
An existing permission entry was found for user [email protected]

As a note to remove a permission you use the command:

Remove-MailboxFolderPermission -Identity [email protected]:\calendar -user [email protected]

You can also check existing permissions with the following command:

Get-MailboxFolderPermission -Identity [email protected]:\Calendar

You can also add the -user to the get command to return the permission for one user.

Hopefully this helps with the permission management of calendars – these commands will also work for other folders and in some versions of Exchange on Premise.