You cannot really compare Linux with Windows in that respect ... I mean, you update windows and linux pretty much as often, Windows has you reboot 27 times a year for updates - on linux that would be 4 to 5
Linux: new kernel -> reboot
Windows: new notepad.exe patch -> reboot
Windows is the only system I know where I have to unplug a USB printer to install the driver, where the driver software needs more than one reboot - one reboot is already bad, but two ?
I seriously do not know what windows is doing in businesses ... I used it for a full month (Windows 7) and the fully updated + latest drivers could not handle hibernate mode properly or unplugging the power cord - in both cases the wifi would just go (no use disabling/enabling device - the card was "disabled" as if I had pressed the button to turn it off). The wifi would also drop every few hours, enabling/disabling the device fixes it but it sucks for online games.
Then you get these delta-search lolipop blahblah toolsbars (I see that on PC's I repair all the time), never seen that on Mac or Linux ...
Then come Patchy Tuesday, it asks for a reboot, which you can postpone twice (4 hours each, 8 hours total), then it will just reboot without warning -> you lose work so you install Linux to avoid losing work.
Seriously, Windows is gonna go! People are really tired of all this shit ...