After Uninstall and try to install again the Client Access Role on Windows 2008 server sp2 and Exchange 2007 all components installed on single server, i;ve found an error on setup log: Uninstalling assembly C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\Bin\Microsoft.Exchange.Clients.Owa.dll because of an error during compilation: Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED)). Please Help

Hi, Go to the path C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\Bin\ and see if you can find the DLL "Microsoft.Exchange.Clients.Owa.dll". If u cant find it there then it must exist in %Exchange 2007 Setup Folder%\setup\serverroles\clientaccess\owa\bin If u find it then on command prompt just register it using following command: regsvr32 "C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\Bin\Microsoft.Exchange.Clients.Owa.dll" and then try to reinstall CAS role. Regards, Laeeq Qazi|Team Lead(Exchange + Sharepoint + BES + DynamicsCRM) www.HostingController.com

thanks, i've try it with no luck. when i execute regsvr32 "C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\Bin\ Microsoft.Exchange.Clients.Owa.dll " i got the following error: the module microsft.exchange.clients.owa.dll was loaded but the entry-point dllregisterserver was not found. make sure that "... microsft.exchange.clients.owa.dll" is a valid DLL or OCX file and then try again Also i try to install the role again and the problem persist.

Hi niurkifa, Do you get any error messages from Exchange setup GUI/Wizard? Try to uninstall all updates relating to exchange and then reinstall the CAS role. If the issue persists, please move to the next step: Remove all the exchange related virtual directories by using exchange management shell: Remove-OwaVirtualDirectory "exchange (default web site)" Remove-OwaVirtualDirectory "public (default web site)" Remove-OwaVirtualDirectory "exchweb (default web site)" Remove-OwaVirtualDirectory "owa (default web site)" If you still cannot install CAS role, can u please provide the setup log for further research? You can upload the log to your skydrive.