Hotmail Contacts on Sierra
I'm helping an elderly friend who has a 6 month old MacBook Air running 10.12.6. She also has an iPad and an iPhone. She has almost no contacts on the Air but the iPad & iPhone have lots and are in sync. I've discovered that the iPad and iPhone have both Hotmail and iCloud set to sync Contacts but the Air does not have the sync option for contacts on the Hotmail account - just Mail and Notes. How do I set the Air to sync contacts using Hotmail? If we look on icloud.com, only the contacts from the Air are there even though the mobile devices are set to sync through iCloud too. It seems Hotmail sync is preventing iCloud sync. I assume it would be sensible to allow only one service to perform the sync.
Secondly, if we get all contacts on all machines, is it possible to keep them while turning off Hotmail sync and turning on iCloud on all devices? (I suppose I could export them as an archive on the Air then import them afterwards.)