MS manage to patch the OS, IE, Office and other software using one mechanism, which is handy. Every other application I use on Windows seems to have its own update checking mechanism.. and the same appears to be true on OSX (unless you buy through appstore).
How do you (generally) speaking get updates on Linux systems? Does your package manager do it, or do apps monitor themselves or is it all down to the administrator to keep on to of these things?
This is assuming you get OS patches and updates in the same way as Windows/OSX, which seems pretty likely... even Linux has bugs!