A new survey of server unit growth and revenue shows that last quarter 1.6 million new servers were put into action, demonstrating that the server sector of the IT economy is growing strong. Linux servers showed the most growth, while Windows servers generated the most revenue. Unix servers showed a decline. Mainframe installations also grew. Our Take: As always these numbers are based on documented sales sales of commercial products, so they should be taken with a grain of salt, as they exclude FreeBSD and Linux servers based on freely-distributed software. Nevertheless, it looks like commercial Unix is in decline, while Linux and Windows move up.