For a Mac user to open a shared calendar on their Outlook, access needs to be delegated to them by the user who owns the calendar. 

Step-by-step guide

1. Go to the File tab in Outlook
2. Under the Info option, select the Account Settings button and then select Delegate Access in the menu.
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3. Then select the Add button on the right-hand side of the box. You’ll need to search the address book for Jim’s email address and add it.
4. A box with permissions settings will pop up. Make sure the below options match, which have everything on None except for the Calendar which will have Read-Only selected.
5. Be sure to uncheck the box below the calendar option.
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6. Press OK and reshare the calendar.

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