Upgrading from SMS 2.0 to SMS 2003 SP1, SP2 or SP3 Causes an Inventory Resynchronization on Clients
Due to changes in hardware inventory between SMS 2.0 and SMS 2003, clients in sites upgraded from SMS 2.0 to SMS 2003 SP1, SP2 or SP3 will perform an inventory resynchronization, sending full hardware inventory reports instead of delta reports. If many clients perform resynchronization at the same time, these inventory resynchronizations can cause excessive load on the network, which results in the site systems in your SMS hierarchy taking a long time to process hardware inventory data.
WORKAROUND: To reduce the load on your network and SMS site servers, consider performing a throttled site upgrade to prevent too many clients from resynchronizing at the same time. For more information about upgrading, see the Microsoft Systems Management Server 2003 Concepts, Planning, and Deployment Guide.