Pointing sync services to icloud calendar

I can successfully sync my Outlook for Mac calendar with with my iMac calendar. I can  also sync calendars between all my Apple devices, iMac, Macbook, Macbook Air, iPad & iphone provided I enter the details using Apple calendar. What I wish to achieve is for any calendar item I enter in to Outlook to sync with all my other Apple products. The key seems to be that all Apple devices use the icloud calendar whereas Outlook synchronises using a non iCloud account. Is there a way to make Outlook default to the iCloud calendar when synchronising.