Once you log into Office 365, click on the App Launcher icon in the top left. Next click on People.
Click on the small dropdown arrow by New and click on Contact list.
Now you can add contacts to this list. As you type names in, it will search the NCC directory. You can also type in external addresses to this field.
Northern California Conference of Seventh-day Adventists | 401 Taylor Blvd. | P.O. Box 23165 | Pleasant Hill, CA 94523 | (925) 685-4300 | firstname.lastname@example.org