Hi,
Since you post the thread in Exchange preview version forum, I assume your exchange version in Exchange 2007.
And in Exchange 2007 (or in Exchange 2010), we cannot change the default calendar permission from EMC. To change the calendar permission in exchange 2007, we can try the script in this blog.
http://blogs.msdn.com/b/emeamsgdev/archive/2012/12/03/powershell-set-calendar-folder-delegate-permissions-in-exchange-2007.aspx
Best Regards.
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Lynn-Li
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