> I think we tried the roll-back too and that failed.
I did a few roll-backs to test the system and they worked perfectly. However, if you're upgrading 400 million PCs, there will inevitably be some errors.
This is why we have backups ;-)
> evidenced by the sheer number of people fooled into it.
How many do you think there were, and what's the percentage error over 400 million or more upgrades?