Can you add delegate access to a user's calendar or mailbox folder via powershell?

Question

Basically I want to know if you can grant a user delegate access to another user's calendar or meeting room using native  powershell commands?
I know you can do this via method 1, listed below, however when you grant permissions in this way and if a user wants to see who has delegate access to their calendar or inbox by going to delegate access in outlook they will not see user's who have access
to their calendar or inbox.
Method 1:
Add-MailboxFolderPermission -Identity "userA:\Calendar" -User UserB -AccessRights editor
The above is a nice and simple way of granting userB EDITOR access to UserA's calendar.
But as stated above as you are using mailboxFolderPermissions and not DelegateAccess, this applies directly to this folder and if userA goes to their delegate access view in Outlook, they will not see that userB has access to their calendar.
I know that you can use the below commands to see a list of user's who have delegate access to you calendar:
Get-Mailbox userA | Get-CalendarProcessing | select resourcedelegates
I am new to powershell and don't know if there is a way of setting delegate access to a user's calendar or inbox/folder via powershell commands, similar to the above.
Any help with this query would be much appreciated!
thanks

Answer 1

Delegate access is simply a combination of folder rights (which you've described) and Send As right, which is conferred by Add-MailboxPermission or Send On Behalf of right, which I'm not sure if you can confer with PowerShell. Set-CalendarProesssing applies
to resource mailboxes like conference rooms, not to user mailboxes.
Update: "Send on Behalf of" is conferred this way:
Set-Mailbox UserMailbox -GrantSendOnBehalfTo UserWhoSends
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