>> In summary, "when you install an update, we keep a copy of the old
>> version
>> as well as the updated one".
>
> Except people seem to be missing this part:
>
> "Service Pack 1 contains a binary called VSP1CLN.EXE, a tool that will
> make the Service Pack package permanent (not removable) on your system,
> and remove the RTM versions of all superseded components."
>
> In other words, if you install the new version and decide you never want
> to roll back to the old version, you can delete the old version.
>
> Seems completely reasonable to me.
>
>> To be completely fair, I've seen Linux package managers that won't
>> redownload stuff you've already downloaded once. The difference being,
>> presumably there's a way to safely delete the cached content if you
>> want to.
>
> There is here too. It's even described in the article.

1. So there's a secret undocumented tool for doing this? Yeah, that's 
really going to help your average Joe who's just trying to keep their 
computer running.

2. It appears to only apply to /service packs/, not the fifty billion 
updates per day that Windows Update will be downloading without your 
knowledge unless you specifically turned it off.

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