I expect some big issues tomorrow.

While recognizing the security benefits of Service Pack 2, some organizations have asked that we provide them the ability to temporarily disable delivery of this update via AU and WU. These organizations have populations of PCs which are enabled to receive all critical security updates via AU. Since Service Pack 2 will start to be delivered to Windows XP Home Edition PCs on August 18 and to Windows XP Professional Edition starting on August 25, these customers have asked for the ability to temporarily block the delivery of Service Pack 2 in order to provide additional time for validation and testing of the update.

[ Microsoft Windows XP Service Pack 2 and Windows Update ]

I've been the guinea pig for my company, and so far it's been smooth sailing. I've reviewed all critical systems and used my computer for regular business and only run in to a few small issues. One security product required an upgrade (which had been available anyway) and CRM needed me to white-list it. I understand that I'll have to tweak security settings if I ever try to setup debugging via DCOM in VisualStudio, but I doubt I'll be doing that so no worries.

Personally, I can't wait until everyone is on SP2, I think Microsoft has done some good work, and it will stop much of the viral shenanigans that have been going on. And the naysayers? Whiners, in my opinion. I've seen nothing insurmountable, and (as far as I can tell) all issues are from the added security, and the added security is what everyone has been begging for, so when you get what you ask for, don't whine about it?