There already exists an organisation

Question

when i am trying to install exchange 2010 on 2008 r2 member server, readiness check is failing at organisation prerequisites asking to modify AD with setup /prepareAD. when i ran prepareAD i get the following error.
 Exchange organization name cannot be specified. There already exists an Exchange organization with name 'XXXX'. 
i think this is because of my earlier unsuccessful attempts of installing exchange. can someone help me to get pass this. thanks
can i give the other name? or can i delete the organisation from ADSIedit?? what ever it takes, i need to get exchange up n running by this Sunday. cheers 

Answer 1

Hi,
You need to remove the Exchange Organization object in the Configuration partition of your Active Directory forest;
The easiest way to accomplish that is firing up the Active Directory Sites and Services console, enable the viewing of the "Services" node (disabled by default), then delete the node called "Microsoft Exchange"
(under which you will have another node representing your organization).
You can also do the same thing using ADSIEdit and connecting to the Configuration directory partition.
You should also remove the OUs "Microsoft Exchange Security Groups" and "Microsoft Exchange System Objects" from Active Directory.
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