Outlook 2016 shared contacts not updating
Click the Plus button and create a new mailbox as shown.
Now that you have a Public Folder Mailbox it’s time to create the root public folder. Click Public Folders at the top of the screen and click the plus button to create a new folder.
Outlook does a pretty good job at matching the contacts but occasionally gets it wrong.
Use Safe PST Backup for migration and the whole Outlook data files you have created will be backed up to the last date.
Back up Email archive, Contacts, Calendar and other folders automatically.
When contacts are incorrectly linked, or not linked, you can correct the links from the contact card.
(You can't bulk unlink all contacts.) Under list of associated contacts (View Source) is a link for Link Contacts.