Hi everyone. I had a DC fail over the weekend. I didn't give it much priority because although it was the first W2K DC I set up, I have moved all the DC activedirectory tasks that only one DC can do, to a second DC. Also our E2K server is also a DC server. So I didn't think that there could be any reason for a problem. However there was. The Exchange server stopped working after a while and after a restart it had a problem with the System Attendant, and because of this couldn't start the Mailstorage, and and and... What is causing this, and is there realy no way of having a W2K system that will still work when one DC fails?? Following are my Error Messages. Unexpected error An unknown error has occurred. ID no: 80040a01 Microsoft Exchange System Attendant occurred. The Metabase Update service failed to start, error '80040a01'. For more information, click http://www.microsoft.com/contentredirect.asp <http://www.microsoft.com/contentredirect.asp> . Process MAD.EXE (PID=1592). DSAccess is shutting down. For more information, click http://www.microsoft.com/contentredirect.asp <http://www.microsoft.com/contentredirect.asp> . An error occurred while starting the Microsoft Exchange POP3 Service: server instance number 1 failed to start with error 0x80040a01 Can anyone help?