This guy is spot on. I've done quite a bit of time in the corporate environment running middleware systems such as LDAP and AD. Google Apps does not have a via

This guy is spot on. I've done quite a bit of time in the corporate environment running middleware systems such as LDAP and AD. Google Apps does not have a viable solution because it is not in house. There is no easy way to extend the schema and integrating with Google Apps is actually quite difficult. There are tools to help you integrate from Active Directory to Google Apps but not the other way around. Also Active Directory is actually pretty awesome from a management standpoint. Suppose today you wanted to have 50k linux boxes with all the same logins. You would probably use LDAP (which is essentially AD under the hood). But how about automatic package management per user? How do you configure that? AD has all this built in and more.