Exchange 2010 introduced a new set of cmdlets that can be used to manage the permissions on the folders inside a mailbox. When it comes to managing recipients, one of the most common tasks that administrators and support personnel perform on a regular basis is updating the permissions on the calendar of a mailbox. In most corporate environments, calendars are shared among employees, and often, special rights need to be delegated to other users that will allow them to add, remove, update, or change the items on a calendar. In this recipe, we'll cover the basics of how to manage mailbox folder permissions from within the shell, but we will focus specifically on calendar permissions, since that is a common scenario. Keep in mind that the cmdlets used in this recipe can be used with any folder within a mailbox.