Personal and Microsoft Exchange distribution lists are not supported in Outlook for Mac.
All Outlook for Mac groups are local and are not synchronized.
But if the group comprises dozens or hundreds of contacts, finding and adding each one individually to the group would be a tedious task.
Because not all types of data are synchronized with the Exchange server, any complete plan for backing up data must include a provision for backing up the unsynchronized data on users' computers in addition to backing up the Exchange Server database.
Outlook 2016 for Mac stores messages and other items, such as calendar events, contacts, tasks, and notes, as a SQLite database in the /Users/username/Library/Group Containers/UBF8T346G9. These database files can be backed up as part of a procedure that backs up the user's home folder.
After you set up your Exchange account, Outlook connects with the Exchange server through the Client Access server to access your mailbox.
Microsoft today announced that it’s adding support for syncing Google Calendar and Google Contacts in Outlook 2016 for Mac.