2701 What irks me: When I open Word or Excel or PowerPoint because I actually want to do something in one of those programs, and before I can even manage to open the file I want to mess with, Microsoft Auto-Updater pops up complaining that MS Office is out of date and there's a critical update available and you should install it and oh by the way you have to close down the program you actually want to run while the update is installing.
It's almost as bad as when I had to boot up into Windoze every week a couple years ago to do webconferences, and the stupid OS would install updates it had already downloaded while the computer was in the process of booting, causing the bootup process on any particular day to take an unpredicatable amount of time, which caused me to occasionally show up late to the webconference.
At least OSX and Linux (the distros I've used, at least) have the sense to install OS updates when the computer is shutting down, when I'd just be going to bed anyway. OSX even gives me the option of not installing the update on any particular shutdown, which is nice.