Exchange Server upgrade from 5.5 to 2K on a Win2K DC

I recently tried to upgrade my Exchange server from 5.5 to 2K (to be able to use my OL 2007).

In the process it failed and suggested I make changes to my AD. I made dozens of recommended changes and believe I’ve turned the AD on my server to mush.

Is there anyway to RE-Install my AD from scratch without losing info (particularly Exchange data). I don’t care if I have to keep the DC name or change it. ANYTHING to make AD accept my Exch 2K. I’d even be willing to wipe out AD and re-install it from scratch (if possible). I’m desperate.

=Dave=