I just installed Win2003 SP2 SBS as domain controller. It worked fine for two weeks. I just installed DNS (even though I'm not using it) because it was needed to fix the 20 minutes login problem. Now I'm getting the MS Exchange errors and I'm not even using Exchange server nor is it installed. MSExchangeMU: Failed to access the metabase, error code is 80040154 (Class not registered). MSExchangeSA: The MAD Monitoring thread was unable to read its configuration from the DS, error '0x80040154'. MSExchangeFBPublish: Error initializing session for virtual machine WDS-SERVER. The error number is 0x8004011d. Make sure Microsoft Exchange Store is running. These errors are repeating about every one minute. Why is this happening?

Dear customer: Since your issue is related to SBS 2003, our forum focuses on Exchange relative problem, this isnt a good place for troubleshoot your issue. Please post the issue into the following newsgroup, maybe you can get more help at there. http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?query=sbs&dg=&cat=en_US_d02fc761-3f6b-402c-82f6-ba1a8875c1a7&lang=en&cr=&pt=&catlist=&dglist=&ptlist=&exp=&sloc=en-us Thanks for your cooperation and understanding. Rock Wang - MSFT