I am running as an Enterprise Administrator and whenever I try to run setup /PrepareAD for Echange 2007I get the following: =============== G:\>setup /prepareAD Welcome to Microsoft Exchange Server 2007 Unattended Setup Preparing Exchange Setup No server roles will be installed Performing Microsoft Exchange Server Prerequisite Check Organization Checks ......................... COMPLETED Configuring Microsoft Exchange Server Organization Preparation ......................... FAILED Active Directory operation failed on map-w2k-svr1.mapcdn.com. This error isnot retriable. Additional information: Access is denied.Active directory response: 00000005: SecErr: DSID-03151E04, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0 The Exchange Server setup operation did not complete. Visit http://support.microsoft.com and enter the Error ID to find more information. Exchange Server setup encountered an error. =============== The Organizational Preparation gets about 95% complete and then fails with this error. Any suggestions?

I found the issue. The Microsoft Exchange System ObjectsCN was first created without the anyone having permission to Write, Create All Child Objects or Delete All Child Objects. When I gave Enterprise Administrators Full Control of the CN and then re-ransetup /PrepareAD it finished without errors and I was able to continue with the install. My question now is what are the proper permissions for Microsoft Exchange System Objects CN?