Exchange Events and Errors Lookup

You just need to Enter the message source and ID in the text field, then click Go

For Exchange 2003 http://www.microsoft.com/exchange/support/2003/ee.asp

For Exchange 2000 http://www.microsoft.com/exchange/support/2000/ee.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/modcore/html/dehowfindingerrorsusingeventviewerpwd.asp