To add permissions on a Exchange Object in Office 365 using PowerShell the cmdlet set-MailboxFolderPermission or add-MailboxFolderPermission can be used.
In this example we add editor permissions for user2 to user1’s calendar. This will enable user2 to edit, add or delete content of user1’s calendar.
set-MailboxFolderPermission -Identity user1@domain.no:\calendar -user user2@domain.no -AccessRights Editor
Note: kalender is the Norwegian Word for Calendar
To bulk add all users in a Tennant as Reviewer to user1@domain.no’s calendar run the following cmdlet.
$Users = Get-Mailbox | Select-Object -ExpandProperty userprincipalname
ForEach ($user in $Users )
{
Add-MailboxFolderPermission -Identity “user1@domain.no:\calendar” -User $User -AccessRights Reviewer
}
For full details of this cmdlet:
https://technet.microsoft.com/en-us/library/dd298062(v=exchg.160).aspx
And for my original Source:
http://theitbros.com/add-calendar-permissions-in-office-365-via-powershell/
