outook free/busy data not available

I am using exchange 2007 SP2.  I have windows outlook clients and Apple 10.7 I believe that use their calendar.  
The problem is that there is a user that when I add to view his calendar to see when he's available, it's greyed out, I have attached a picture so the issue can be seen.

How do I fix this problem?
outlook.jpg
DanNetwork EngineerAsked:
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jrlingamCommented:
Check the permission for the Default in the calendar permissions of the user whose calendar you are trying to view. It should be set to Free/Busy Time. If it is set to None you will not be able to view.
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DanNetwork EngineerAuthor Commented:
Is that on the Mac or in exchange?  Not sure where to set those permissions.
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jrlingamCommented:
it should be set in user calendar properties in outlook.
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DanNetwork EngineerAuthor Commented:
He does not use Outlook,  he uses I calendar on a Mac
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DanNetwork EngineerAuthor Commented:
so what permissions exactly need to be set on the MAC, where do I find them?
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DanNetwork EngineerAuthor Commented:
I have a mac and i looked all over the settings and preferences but I don't find it anywhere.
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DanNetwork EngineerAuthor Commented:
I am just going to close the case, as I couldn't figure it out.
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