Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
Regular hours, the update is minor. Naturally you should ensure you have a backup of the System State before hand (no reports of it ever doing anything nasty, but it never hurts to be careful). It adds a few extra attributes to the Schema almost all of them to do with DFS.
If you're not sure about the process at all then you can read the MS document about it here:
http://www.microsoft.com/downloads/details.aspx?familyid=5B73CF03-84DD-480F-98F9-526EC09E9BA8&displaylang=en
The ADPrep tool is on the second CD of the retail set, not sure where they put it when you get it with the server. The exact location is in the document above.
Chris