Q: contacts wont sync from iphone, they synced some but not all

The following may help: Get help using iCloud Contacts, Calendars, or Reminders - Apple Support

Many things in there may help but I would mention in particular the section about "See which account your contacts are in"

You can export/import vCards from/to either the Contacts app on a Mac or iCloud.

On the Mac, open the Contacts app, select all contacts and then File menu > Import or File menu > Export > Export vCard

On iCloud at https://www.icloud.com/ open the Contacts app and use the gear-shaped icon at lower left to select all and to Export/Import

This is the first mention of Outlook. I have Outlook (Microsoft Office for Mac 2016) installed on my Mac but I don't use it so I may not be much help.