#2 - Yahoo!

Yahoo! grew rapidly during the early 1990's but its failure to adapt to the rise of Google and Facebook, caused the company's revenue to go into decline as it was unable to monetize many properties effectively.

Looking to expand its online presence, Microsoft made an offer to purchase Yahoo! Inc in February 2008 for approximately $47 billion, which Yahoo! rejected.

Microsoft CEO Steve Ballmer then directed his company to create its own search engine and web properties under the Bing and Windows Live brands.

Yahoo! went into losses in 2008. As of September 2011, the market capitalization of Yahoo! Inc. has plunged to a low of $17.66 Billion, a far cry from Microsoft's original offer of $47 Billion.

#1 - HP TouchPad

In 2011, HP's TouchPad tablet computer was finally released for $499 to highly unfavorable reviews. HP quickly attempted to adjust price by discounting the product $100, in the hopes that consumers would latch on.

During HP's 3rd-quarter earnings call, and less than two months after the TouchPad's launch, CEO Apotheker dropped a bombshell -- that it would be remove HP's mobile hardware division which produced the TouchPad, Pre and Veer WebOS devices, and would be looking for an alternative strategy for the mobile OS.

The whole tech world went against him and company had a $99.00 per unit fire sale of its entire tablet computer inventory.