We have been running Exchange 2007 for a month or so and are attempting to migrate from our current webcalendar to exchanges calendaring system. One of the things we have on our current "Web calendar" is the ability of the secretary of the office to assign out of office times to peoples calendars. That is possible with exchange 2007, but having people go through their outlook calendars permissions and add the secretary and make her a author isn't a step we want our users to have to make. We would like to assign her permissions via powershell to have author access to their main calendars so she can add that out of office data whenever she needs to. I have combed the powershell for a way to do this but have found nothing yet. You can use set-mailboxpermissions to set "Mailbox" permissions which is all encompassing but we only want to give her those calendar permissions. Is this currently even possible with the cmdlets that are provided with exchange? Any help would be appreciated.