If you’re thinking of upgrading to Windows 7 when it comes out, now might be a good time to preorder. Today, Microsoft said customers who pre-order a copy of Windows 7 will receive more than 50% off the retail price for a limited time. Here’s a look at how the discounts break down: Full Version Upgrade from Vista or XP Discounted Upgrade Price Windows 7 Home Premium $199.99 $119.99 $49.99 Windows 7 Professional $299.99 $199.99 $99.99 Windows 7 Ultimate $319.99 $219.99 To take advantage of the offer, customers