there already exists an organisation

Question

_{Thursday, June 9, 2011 7:29 PM}

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 

All replies (7)

_{Monday, June 13, 2011 2:02 AM ✅Answered | 2 votes}

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.

Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

_{Thursday, June 9, 2011 10:05 PM}

You will have to delete the ORG from Adsiedit and than continue with the installation.
Is it the first exchange server you are installing? Gulab | MCITP: Exchange 2010-2007 | Skype: Gulab.Mallah | Blog: www.ExchangeRanger.blogspot.com

_{Friday, June 10, 2011 9:02 AM}

yes, it is the first one. but i did several unsuccessful attempts before. now i formatted the member server and trying it again. this is the error i got now. 

_{Monday, June 13, 2011 10:04 AM}

thanks for all your posts guys. after so much of hassle i managed to install exchange 2010.

if someone is looking for the fix, deleting otherwellknownobjects from CN=microsoft exchange in CN=services did the trick. use ldp.exe to edit these. cheers

_{Tuesday, January 22, 2013 2:24 PM}

Absolutely brilliant. I was banging my head against the table for so long.

ChinaJack10

_{Monday, April 27, 2015 2:40 AM}

This did the trick, thanks!

_{Friday, November 10, 2017 2:43 AM}

Thanks Jason. you are the man