One of the biggest victims of the change looks like being the famed kaizen (step-by-step improvement) system that was pioneered by Toyota in the 1970s and has been treated as gospel by manufacturers throughout Japan ever since.

ECONOMIST: The land of disappointments | The

Sadly it seems that immediately after making the paranoid happy by instituting two-step authentication a pretty massive flaw in Cupertino's system was discovered and first reported by The Verge.

ENGADGET

The Upgrade Assistant will walk you through the upgrade process step-by-step, from purchase to download and then to installation of the operating system.

FORBES: Microsoft Announces A Limited Time Windows 8 Pro Upgrade For $39.99