Yes!
From your main forum click PEOPLE. this shows a page with all people in your forum listed.
You can filter the list to show only members of particular groups or those online.
You can also edit or extract lists of users in all groups including "authenticated" via:
OPTIONS > USERS > MANAGE USERS AND GROUPS
You could, for example, copy out the list of member's usernames and email addresses and use a text editor or spreadsheet program to produce an alphabetical list.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.