Google Groups
Groups can be used as mailing lists, discussion forums, and to share calendars, docs, sites, and videos with co-workers.
Get started with Google Groups
Using Google Groups 

Use this guide to:

  • Find groups in your Groups directory
  • Create and join groups
  • Browse and search group discussions
  • Send mail to a group
  • Invite a group to a meeting
  • Share a doc with a group