< http://www.gartner.com/reprints/microsoft/106576.html
(I'm a little biased) />
While interesting this research ignores all of the open source options. MySQL has a huge installed base, and Postgres is a full-featured RDBMS which is rapidly growing. FoxPro makes an excellent front-end to both.
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Stephen Cox
geek for a socially conscious real estate company and a few non-profits and political campaigns.