The Outlook for Mac 2011/2016 desktop applications don't provide the ability to subscribe to an internet calendar, but there is a workaround that may work for you.
You can view your Confluence Team calendar directly in Outlook as you would any other shared calendar using iCal synchronization. This is also known as subscribing to a Confluence calendar.
One-way synchronization means that you can view, but not update, Team Calendars events in Outlook.
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