A lot of things have changed since Slammer, ... Customers are more aware of the need to move into a maintenance mindset. Customers using Windows 2003 Server SP1 [Service Pack 1] weren't impacted by the vulnerability because of changes we made. This is best example of learning how to make product more resilient to attack and have it be secure by default.  -   Stephen Toulouse     Quotes
A lot of things have changed since Slammer, ... Customers are more aware of the need to move into a maintenance mindset. Customers using Windows 2003 Server SP1 [Service Pack 1] weren't impacted by the vulnerability because of changes we made. This is best example of learning how to make product more resilient to attack and have it be secure by default. Stephen Toulouse