Whenever you shut down Windows server 2003 R2, the dialog box gives you a list of reasons why, which can presumably be used for later analysis of what causes system reboots.

Only while there is OS Configuration changes (planned) and application maintenance (planned), there is no option for "OS maintenance monthly security updates". Which is odd, because rebooting after the monthly updates is pretty much mandatory, and those monthly updates are pretty much a given (whereas on ubuntu linux there's a continual background trickle of pending patches appearing on no specific schedule).

So why isnt there somewhere in the drop down list an option to say the reboot is to patch the OS. There is "security issue", but that has more of a panic associated with it. It's almost is if somebody didn't want to collect the data...