$0.02 x 18B shares = $360,000,000
Yes, but they still made a healthy profit. $360M USD is a large amount of money but as a fraction of their overall revenues or profits, it's not any kind of game killer for them.
The comparison of Win7 to Leopard or SL is important, don't get me wrong. But Windows XP stole a lot more of Vista's market share than Tiger and Leopard did combined. So Microsoft's first challenge is still to appeal to their existing customers. If they can do that, they'll be awash in profits and they have a couple of years to continue thinking about what to do about Apple before Apple tops out and exits their comfortable "niche" in the market for OSes