Quite often when you work with AD, you need some extra attributes to store customer specific information. I normally use the extensionAttributes (1 through 15) for this.
The problem is that they are not in AD out-the-box.
They are part of the Microsoft Exchange Server schema. The schema is the only part you have to install. You do NOT have to install Exchange.
I used Exchange 2010 SP2. I guess you could download the trial version if you don’t have the DVD to hand?
To install, just run “Setup /PrepareSchema” to have the additional extension attributes added.
Note that you need to be a “Domain Admin” & “Schema Admin” & “Enterprise Admin” in order to run this script.