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Error during Exchange 2007 setup /PrepareAD

Hi There

I have setup a new 2003 R2 64bit system with SP2 fully updated. I am then doing all the prerequisites that are needed before installing exchange 2007 enterprise edition.

When I run {setup /p /on:domain name} I get the following error

Performing Microsoft Exchange Server Prerequisite Check

Organization Checks .............COMPLETED

Configuring Microsoft Exchange Server

Organization Preparation ......FAILED

Active Directory operation failed on The object 'CN=All C
ontacts,CN=All Address Lists,CN=Address Lists Container,CN=COMPANY NAME,CN
=Microsoft Exchange,CN=Services,CN=Configuration,DC=NAME,DC=com' already exists.

The Exchange Server setup operation did not complete. Visit http://support.micro and enter the Error ID to find more information.

Exchange Server setup encountered an error.

I currently have exchange 2003 SP2 running in my organisation.

Could someone help me with this problem please

Please see: for ideas that have already been tried
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Matthew Millers
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That worked like a dream, thank you so much.