This isn’t an issue we see very often just because SQL 2000 is nearly at the end of its supported lifecycle and this only affects those installed on Itanium Servers, but I thought it would be worth a mention here just in case anyone runs into it.
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Read the complete post at http://blogs.technet.com/operationsmgr/archive/2009/04/29/opsmgr-2007-sql-2000-on-windows-server-2003-itanium-servers-may-not-be-discovered-by-the-sql-mp.aspx