Hi, Dear All i require your help on this.tried all sites and knowledge base also. Mail System : Microsoft Exchange 5.5 Enterprise with SP3 Problem : Event ID : 2140 An Internal Windows NT Error Occured. Microsoft Exchange Event Service is not starting. Please help, have already tried the solution available on Knowledge base by replacing dll files.Still the Event Service does not start. Thanks. Sincerely, Manish --------------------------------- Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now