SME Server talk:Documentation:Administration Manual:Chapter9
Groups
This screen allows you to create, remove or change user groups, which are simply lists of people with a shared interest - for example, they work in the same department or are collaborating on a project. The user group function serves two purposes in the SME Server: it permits email to be sent conveniently to a group of users, and it allows the system administrator to associate groups of users with a single information bay (i-bay).
Creating a new group is a simple three-step process. You enter the group name (as with account names, these should begin with a lower-case letter and consist only of lower-case letters and numbers), followed by a brief description. Finally, check the boxes next to the names of the users who should be associated with that group.
bugzilla:6934
After you add (or remove) a user account from a group, the user must log out and log back in for those changes to take effect. Until the user does so, he or she will still have their old group membership information. For instance, suppose you create a new group "sales" and assign user "ffrog" (Fred Frog) to that group. You then create a new i-bay called "salesinfo" that only the "sales" group can access, until Fred logs out and then logs back in he will not have access to the new "sales" group and its ibay "salesinfo".
Setting Windows Admin Rights
If you are using SME Server as a domain controller and the windows workstations have joined the domain then by adding users to special groups you are able to change the rights a users has on that workstation.