Move over, Apple (Nasdaq: AAPL), Microsoft (Nasdaq: MSFT) and Amazon (Nasdaq: AMZN). Another tech stock is jumping into the electronic tablet pool.

A weak earnings report this morning put an untidy bow on what has been a sloppy year for Barnes & Noble (NYSE: BKS).

Barnes & Noble’s (NYSE: BKS) stock is soaring to new heights this morning after Microsoft (Nasdaq: MSFT) agreed to invest $300 million in its Nook Tablet business.

The Kindle Fire was expected to ignite Amazon’s (Nasdaq: AMZN) fourth-quarter earnings. Instead the company flamed out amid lower-than-expected sales.