The link to Add All Authenticated Users that appeared on the Edit Group page in previous versions of SharePoint products has been removed from SharePoint Foundation 2010 and Microsoft SharePoint Server 2010.
You can still grant permissions to all authenticated users in Windows-authenticated environments.
Important: Granting permissions to all authenticated users grants access to all members of your domain, which could include vendors, partners, and people from other companies.
- To grant access to all authenticated users in your domain:
- Click Site Actions, and then click Site Permissions.
- Click Grant Permissions.
- In Select Users, type NT AUTHORITY\authenticated users.
- Choose the group to which you want to add all authenticated users from the drop-down list.
- Click OK.
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