That said, I suspect based on your reference to SetPerm that you're really trying to assign everyone Read permissions to everyone else's Calendar folder within Outlook. If that's the case, you're on the right track. There's no native way aside from using SetPerm to achieve what you're looking for.
Unfortunately, this utility is not well documented, and the only Web site that I'm aware of that even gives SetPerm passing mention is the Microsoft Exchange Blog maintained by Chris Meirick, Neil Hobson and William Lefkovic.
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