On Outlook with iOS birthdays, why are there duplicate entries, and also no contact name?

This is starting to piss me off.

I get that Microsoft and Apple don't like to play nice together, but they make it impossible for users to self-remedy these issues. I don't know who to b*tch to, so I'm b*tching to both.

First, there are duplicate birthday entries, even though in my contact list there are no duplicates, and I only have iCloud contacts.
Second, none of the birthday entries in Outlook show contact names.

Does anyone have a solution/workaround?