I'm looking for some assistance with the permissions needed to allow anonymous/public access to a mailbox in Exchange 2007 (soon to be Exchange 2010). The access needs to be able to view the calendar appointments, but not appointment specifics and must not require a login to see the contents.
I'm aware how to point people to the resouce, but haven't yet found the trick to the permissions. URL for access would be http://exchange.school.edu/owa/[mailbox_SMTP_address]/?cmd=contents&module=calendar.
Anyone accomplished this or have a recommendation?
Exchange 2010 SP1 introduces Internet Calendar Sharing, which essentially allows you to do what you want. The Exchange team posted a very detailed blog post recently about the topic, which I highly recommend you read over.
Basically, Exchange publishes your calendar in iCal format which anybody can subscribe to. The instructions to set it up are in this TechNet article.