A handy list from Microsoft's Don Dodge.
James Nicholson compiled a list of the 10 worst Internet acquisitions. There were lots of bad acquisitions so it is hard to keep the list to just ten. But, here are my nominations for the worst Internet acquisitions of all time. To get on my list the acquisition must be at least a Billion dollars, must have disappeared from view or lost the market share race, and must have been acquired at least 18 months ago. It takes a while to really know if an acquisition was a success or failure.
He also points to another useful reference:
Tom O'Keefe maintains a pretty comprehensive list of Internet Acquisitions on the ResearchConnect.com site. I used this list in compiling my worst billion dollar acquisitions of all time.