#3. Microsoft Buys Skype
Actually, eBay (EBAY) bought Skype first for $2.6 billion in 2005, on the way to become one of the top internet stocks. It then sold a majority stake in 2009, before Microsoft (MSFT) swooped in and bought the whole thing for $8.5 billion in 2011.
Part of the reason MSFT paid so much, according to analysts, was the unique structure of the deal that allowed Microsoft to use foreign cash for the deal and thus avoid hefty U.S. taxes in the process.