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Missing Exchange 2007 Security Groups

I installed Exchange 2007 in a domain which never had Exchange in it before and things went well. After things were working, I decided to reload the OS on the server to change hard drive configurations to make sure everything was installed cleanly, as there were things I had played with and had to redo. Now, I can't install Exchange off the DVD, the recover server command fails (but still installs some of the basics), and IIS on the new server is empty along with the Exchange Security groups missing in AD. Is there a way to back the changes out of AD to start this all over again? I was hoping for a clean install but I'm starting to realize that a lot of the settings are stored in AD and are all messed up now.

are you trying to remove exchange 2007 completely from the domain and then install it again?

ASKER

I think that's the best bet at this point, so yes.

delete the exchange folders and also delete exchange from adsiedit.msc
then start from scratch by following all the steps again.

ASKER

Which folders exactally?

the folders in which exchange 2007 was installed?

ASKER

What part of AD in adsiedit? As far as the server goes, I've reloaded the OS, so there's no Exchange on it any more.

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ASKER

I get an access is denied error. I'm a domain admin, and schema admin. Are there other permissions I need?

domain admin is fine

ASKER

I had to delete the object inside of the Exchange folder, then I could delete the folder. Installation of Exchange seemed to work after that. Thanks!

ASKER

Thanks much! You helped out tons and save the company a lot of money!