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Looks familiar, doesn't it? There's no Start button in the lower left corner, but moving the mouse pointer to a corner on the right exposes this Charms bar.
When you press Windows key + C or move the mouse from either right corner toward the center of the screen, this fully labeled Charms bar appears.
The Start button gone? Not exactly. Aim the mouse pointer at the lower left corner to display this hint, clearly labeled Start. Click in that corner and you'll be whisked immediately to the Start screen.