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Ah, I remember the Good Old Days of Service Packs! *sigh*
It's funny, because in one sense, Microsoft was forced to adopt the Linux/open-source model of running updates, modulo gathering them into a monthly release batch because otherwise Win Admins around the world would march on Redmond with torches and pitchforks (again).
I still have my WinXP SP3 and Win7 SP1 install CDs, oh, life was so easy.... :-)