Symantec Support. Now that Microsoft is going to discontinue support for the "gold" XP, they are forcing everyone to upgrade to SP2.
Interesting, this is the hardest core shift I've seen lately, but it makes me worried about the machines I have that aren't SP2 yet. Here's a note on how Norton works with SP2. The short version is that Ignition's version of Norton doesn't quite work, but at least won't crash with it. It doesn't interact correctly with the new security manager. If you have Norton 2002 or later you are fine, but we are running Norton Corporate V7. Yikes, makes you want to go to the Mac!