I am migrating a SBS2008 Installation to Exchange 2010 sp1 After running Setup /Prepareschema Setup /PrepareAD and Setup /PrepareForest I am able to run the installation, however it is failing at the step "Organization Preperation" With the error message. Summary: 12 item(s). 0 succeeded, 1 failed. Elapsed time: 00:00:07 Organization Preparation Failed Error: The following error was generated when "$error.Clear(); if ($RolePrepareAllDomains) { initialize-DomainPermissions -AllDomains:$true -CreateTenantRoot:($RoleIsDatacenter -or $RoleIsPartnerHosted); } elseif ($RoleDomain -ne $null) { initialize-DomainPermissions -Domain $RoleDomain -CreateTenantRoot:($RoleIsDatacenter -or $RoleIsPartnerHosted); } else { initialize-DomainPermissions -CreateTenantRoot:($RoleIsDatacenter -or $RoleIsPartnerHosted); } " was run: "Cannot find the Exchange Organization Administrators Universal Security Group by using its well-known security identifier 29a962c2-91d6-4ab7-9e06-8728f8f842ea. Please make sure that Setup /PrepareAD has been run.". Cannot find the Exchange Organization Administrators Universal Security Group by using its well-known security identifier 29a962c2-91d6-4ab7-9e06-8728f8f842ea. Please make sure that Setup /PrepareAD has been run. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex88D115&l=0&cl=cp Elapsed Time: 00:00:07 However when I view the Domain Controller for the site I can confirm that the Exchange Organization Administrators group exists in the OU "Microsoft Exchange Security Group"

I recommend that you post your question to the SBS forum since it's different from standard Exchange and AD and their MVPs and others are more familiar with upgrade strategies for that product. http://social.technet.microsoft.com/Forums/en/smallbusinessserver/threads Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Thanks. I ended up reinstalling the DC for that site and it resolved the problem. I believe the problem was related to replication issues.

Hi Michael, Thanks for sharing. It is very helpful.Frank Wang TechNet Community Support