Sync Outlook 2015 calendar with iCloud on OS X El Capitan

Hi,

I am a new Mac user, but an IT professional with years of experience in other OS's.

My Macbook runs El Capitan. I have recently installed Microsoft office 2015. My goal is to use the Calendar feature in Outlook.

My existing calendar is on iCloud. I can log into iCloud from any browser and look at my calendar. No issues. I can open Calendar on my Mac and see all my appointments, no issues.

However, when I try to sync Outlook with iCloud the Outlook calendar remains empty.

I have tried setting up the iCloud account information in Outlook automatically and manually. In both cases I get the green 'dot', i.e. it authenticates my credentials. No errors. But no calendar events either.

Thanks in advance