By default the most out of the box Open Atrium provides is username token for email messages.
Not sufficient if you plan to use OA in a professional environment. Also username is shown in listings instead of user's full name while it really ought to be users full name. 

Here's a solution to the problem:

1. Install & enable the realname module: http://drupal.org/project/realname (dev release since there's a bug with Imagecache Profile)
2. Install & enable auto_nodetitle: http://drupal.org/project/auto_nodetitle
3. Go to administer > content management > content types
4. Click 'manage fields' for the 'profile' content type
5. Add a text field called Full Name
6. Edit the main settings for the profile content type by clicking 'edit' from the content types list
7. Expand the "Automatic title generation" fieldset, which for me was the first fieldset on the screen
8. Choose 'Automatically generate the title and hide the title field'
9. Under "pattern for the title", enter: [field_profile_fullname-raw]
10. Go to Administer > User Management > Realname
11. In the general tab, check 'Show realname in nodes', and 'Overwrite user fields in view to show realnames'
12. Click the 'module' tab, select 'content profile', and click 'use this module'
13. In the 'fields' tab, choose 'Full Name' and save.
14. In  Messaging templates insert [realname-node-author] for node author's display name and [realname-comment-author] for comment author.

On a related note -- if you want your project names in emails (Casetracker Project title field) then this little patch here does the trick.

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