Events and Errors Message Center
There are so many times when you see some error in the event logs and don't know what exactly caused the error as the description isn't clear enough... well this is for you !
Microsoft's Events and Errors Message Center lets you enter Event Source and Event ID and get a detailed explanations, recommended user actions, and links to additional support and resources.
Currently the events and errors center supports the following applications:
Windows Server 2003
Windows XP Home/Professional
Windows 2000 Professional/Server
BizTalk Server 2004
Exchange 2000 Server
Exchange Server 2003
Host Integration Server 2004
Microsoft Office
SQL Server Notification Services
SQL Server Reporting Services