Set Outlook delegate permission with PowerShell

Sometimes my users ask things I didn't know existed.

The question I got was: Why can't I see the meeting invitations sent to the persons mailbox and calendar I manage in my own inbox? I knew it had to do with delegates, but thought that could only be set by the owner of the mailbox. Turns out I was wrong, it can be set by the admin with PowerShell.

It's always PowerShell 😜

First check the current permissions:

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Get-MailboxFolderPermission "TargetUser:\agenda" FolderName User AccessRights SharingPermissionFlags ---------- ---- ------------ ---------------------- Agenda Default {AvailabilityOnly} Agenda DestinationUser {PublishingEditor} Delegate Agenda SomeUser {Reviewer} Agenda SomeUser2 {LimitedDetails} Agenda TargetUser {LimitedDetails} Agenda SomeUser3 {Editor} Delegate

Then remove all the existing permissions for the destination user:

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Remove-MailboxFolderPermission "TargetUser:\agenda" -User DestinationUser Confirm Are you sure you want to perform this action? Removing mailbox folder permission on Identity:"TargetUser:\agenda" for user "DestinationUser". [Y] Yes [A] Yes to All [N] No [L] No to All [?] Help (default is "Y"):

There's a few things to note before setting the permissions. To be able to grant the delegate permissions and all options the AccessRight has to be "Editor", the SharingPermissionsFlags need to be separated with a comma, and the option to SendNotificationToUser expects a boolean value so set a $False for no notification or $True to send a notification to the user:

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add-MailboxFolderPermission "TargetUser:\agenda" -User DestinationUser -SharingPermissionFlags delegate,canviewprivateitems -AccessRights editor -SendNotificationToUser $true FolderName User AccessRights SharingPermissionFlags ---------- ---- ------------ ---------------------- Agenda DestinationUser {Editor} Delegate, CanViewPrivateItems

That's it