Hi All, We have installed Exchange 2010 CAS server in existing 2003 Exchange organization. We have 3 child domains and each domain as 2003 exchange servers deployed. We are unable to launch EMC after installing the first CAS server. Powershell launches fine but some commands do not work. We have already done the following fixes but none have helped, we request some suggestions and possible fixes. When we launch EMC we get the following error "Unexpected error 0X170468A8 while executing command 'Get-logonUser'." Have installed are pre-reqs described in Technet. Added the user account to Exchange server management, Organization management, exchange interorp, exchange servers and exchange trusted servers RBAC group, Ran the WinRM quickconfig command Checked firewall settings Tried installing another CAS server but issue persists on that server too. checked the SID history as the servers are virtualised. We are planning to log a case with Microsoft but wanted to check here first if we get any more possible fixes from production environments who have faced the issue. Regards Heman Gupta

Do you see anything in App Log? I would give a shot running Setup.com /preparead and check the issue. Are you running Exchange 2010 RTM or SP1? Gulab | MCITP: Exchange 2010-2007 | Lync Server 2010 | Windows Server 2008 | Skype: Exchange.Ranger | Blog: www.ExchangeRanger.Blogspot.com