Today at work, I had a deadline to meet an hour or so ago. Because I'm bad at that kind of stuff, I generally don't close the .doc file I'm working on, so in the morning I see it and finish it up. Not closing something is better than leaving a reminder in my calendar, because Outlook often doesn't alert me ("Error: couldn't start notification service" or something stupid like that). So instead of that, I leave stuff open.
Yesterday evening, the patch-Tuesday stuff came through, and it automatically rebooted my computer for me, effectively closing the stuff I had open. So today rolled around and, of course, I forgot about it until too late. Although it's not a big deal, it's a huge annoyance.
It seems that there are two ways to stop this. One is to stop automatic updates altogether (probably only stop it temporarily, when it bugs you to reboot), and the other is to disable auto-reboot in the GPO (actually, you have to enable "no auto-reboot" -- my brain hurts). This document goes through these:
http://www.codinghorror.com/blog/archives/000294.htmlHope that helps somebody!