Corporate directories aren't something I'm familiar with, so forgive me if this question seems naive: Does Google Apps for Business (i.e. http://www.google.com

Corporate directories aren't something I'm familiar with, so forgive me if this question seems naive: Does Google Apps for Business (i.e. http://www.google.com/enterprise/apps/business/ http://www.google.com/enterprise/apps/business/ ) have a viable solution for the corporate directory, or do they just expect you to use a third-party solution like Microsoft Active Directory?