apple iCal evidently requires specific permissions to be set on exchange 2007 calendars for access. for MS outlook users the usual permissions typically suffice for calendar viewing (free/busy time, subject, location). for iCal to function the user who access is shared to must explicitly be defined as a Reviewer for the calendar. this should resolve iCal reporting having “no access” to the calendar.

source:
https://discussions.apple.com/thread/2153053?start=0&tstart=0

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