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My Calendar app has gone blank

My Calendar app has gone blank, have lost all appointments. I tried going into Time Machine but after I went back into the "real world" it says Calendar can't be modified or deleted because it is required by Mac OSX. I have OS10.8.5. Can someone please help.

OS X Mountain Lion (10.8.5), Model Name: iMac Intel Core i5

Posted on Feb 19, 2014 2:21 PM

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My Calendar app has gone blank

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