Active Directory Object Classes

Here is a couple reminders about the objectClass that are in Microsoft ActiveDirectory

User

1. sAMAccountName
2. sn
3. givenName
4. cn
5. mail

Group

1. sAMAccountName
2. description
3. mail

Also one trick is you should search for "(& (objectClass=user) (!(obectClass=computer) ))" since the computer objectClass extends a user. :)