I get the following error when I try to install Exchange 2010 into a domain. It had Exchange 2007 but it was just installed as a test and I deinstalled it. Now I am trying to install the first Exchange 2010 server. The domain is at the 2008 level. Organization Preparation Failed Error: The following error was generated when "$error.Clear(); if ($RoleDomain -ne $null) { initialize-ExchangeLegacyPermissions -Domain $RoleDomain -DomainController $RoleDomainController; } else { initialize-ExchangeLegacyPermissions -AllDomains:$true -DomainController $RoleDomainController; }" was run: "Object reference not set to an instance of an object.". Object reference not set to an instance of an object. Elapsed Time: 00:00:01

Hello Are you done with Preparing schema, legacy permissions and AD ? Before installing exchange 2010 in Co-existance scenario you need to prepare schema legacy permissions http://technet.microsoft.com/en-us/library/aa997914(EXCHG.80).aspx Thanks Mhussain

I thought it might be that but I get the same error when I try /prepareschema or /preparelegacyexchangepermissions Steve

Hi, Please go-through the below link, this tells where you have gone wrong. The below link has the step by step proceduce to install the Exchange 2010. http://technet.microsoft.com/en-us/exdeploy2010/default.aspx#HomeRavi | MCSE Messaging - 2003. This posting is provided "AS IS" with no warranties, and confers no rights.

Hello Are you done with Preparing schema, legacy permissions and AD ? Before installing exchange 2010 in Co-existance scenario you need to prepare schema legacy permissions http://technet.microsoft.com/en-us/library/aa997914(EXCHG.80).aspx Thanks Mhussain

Hello what are the credentials you are logged in with ? Try using setup.com /Pl setup.com /pad Thanks Mhussain

Hello what are the credentials you are logged in with ? Try using setup.com /Pl setup.com /pad Thanks Mhussain

do you have the security groups below Exchange Domain Servers Exchange Enterprise Servers if yes take a sys state backup of a AD. delete these groups and run the setup again, Dhruv

Hi Steve, Any updates? Please follow the below link to prepare the AD first. Prepare Active Directory and Domains http://technet.microsoft.com/en-us/library/bb125224.aspx Please also post the error message in the C:\ExchangeSetupLogs\ExchangeSetup.log here. Frank Wang TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com 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.

Thank you. This did it. Steve

I was having the same issue as the original poster. Deleting these two items from the AD fixed the problem for me. Thanks to the poster of this fix. Curt