Why was Teradata able to become the leader of data warehousing at the super high-end (e.g. greater than 25 TB’s)? Why was Netezza only the second pure-play data warehousing company to go public by focusing on the 10 – 25 TB range of opportunities? Why did Oracle after so many years of denial finally announce a joint hardware / software product for data warehousing with HP, the Exadata data warehouse server? Why did Microsoft acquire DATAllegro, one of the earlier data warehousing appliances? Why are there now dozens of data warehouse appliances available on the market today, and – more importantly – how should a customer choose which one to purchase?