When the iPhone was released, Microsoft's Steve Balmer laughed at it indicating that he did not think it would appeal to business customers. The iPhone has gone on to change every smart phone out there.
Apple announced the iPad on January 27, 2010, and the market began to change. The HP Slate had shown off at the CES in January 2010 by Steve Balmer, and it has now been withdrawn from the market.
With rumors of over a 1,000,000 shipped in less than a month, in only the US market, it will change the way people see computers.