The "Global Address List" includes all UNM contacts. (Until the transition to Outlook is completed it is indicating both a "salud" and a "unm" email for all HSLIC employees.)
"Health Sciences Center" includes HSC contacts only.
"Contacts" includes all manually added contacts or distribution lists. These can be both "non-UNM" and UNM contacts. Contacts that are manually entered into "To..." field can be generated again through auto-fill but they won't show up on this list unless they are added to address book ("People" tab) as a "New Contact."