With Windows it's critical, not seen a really dangerous zero-day with Ubuntu yet.

But I may have missed it - was too busy with all the Windows updates:

Adobe (PDF, Flash), anti-virus, windows patches, various firefox plugins, oh, and using a printer over USB means that I had to re-install the %&%ç* thing from scratch as Windows couldn't recognise it already HAD the drivers (it started as USB, then lived on a print server).

It seems more and more of my computing environment appears to be designed to keep me FROM work or at least interrupt it as often as possible. Time to buy a Mac and avoid MS software, I guess. At least I'll get some work done.