Even though Microsoft's Surface tablet won't be officially available until Friday, Microsoft's online store has already run out.
Microsoft's online store says the Surface model running the special, tablet-optimized Windows RT operating system, which sells for $499 to $699, is on backorder, reports Gregg Keizer at Computerworld.
Depending on the model, customers will have to wait two to three weeks after the official release date before Microsoft can deliver the tablet.
