I have created a Contact List app in Sharepoint, however, I cannot see any way to share or sync it with Outlook or any other part of the 365 world. The most important thing for me was to have a contact list with bespoke fields for our management committee to be able to use and amend where necessary. It needed to be shared across the organisation. I found the Contact app in sharepoint and added it, I added the bespoke fields and it is there in the site content, but I cannot get it into Outlook. It used to be possible when there was a ribbon, but so much functionality seems to have been removed. I have had so many problems with finding ways to create truly editable shared contact lists across an organisation. Especially so that new contacts can be added by anyone!