KB913801

Summary - After upgrading a MOM 2005 SP1 database server to SQL Server 2005 you notice event and performance latency issues. A hotfix is required to correct this issue.

http://support.microsoft.com/?id=913801

See the following KB article which covers all hotfixes required for support of MOM 2005 SP1 on SQL Server 2005 (includes SP1) http://support.microsoft.com/?id=917615