Here's a note about IU that I just noticed, don't know if you guys were aware of this."Important changes to Intelligent Updater
For retail editions of Norton AntiVirus, Intelligent Updater now searches for a valid subscription to virus definitions before it applies updates. Corporate versions of Norton AntiVirus are not affected by this change.
Corporate customers:
If you are running Norton AntiVirus Corporate Edition, contact your company's network administrator regarding Norton AntiVirus updates.
Symantec Upgrade Insurance provides corporate customers with valid subscriptions to virus definitions and other benefits. If your Upgrade Insurance has expired, you can renew it by contacting your local sales representative or reseller.
Home and small business customers:
Virus definitions are available from Symantec with a paid subscription. If you purchased a retail version of Norton AntiVirus, Intelligent Updater detects whether your subscription is up-to-date. If your subscription has expired, you must renew it before using Intelligent Updater. Please run LiveUpdate from Norton AntiVirus to renew your subscription or access our online subscription renewal form.
For instructions on how to find your antivirus subscription expiration date, click here."