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For behind all the rhetoric, Sun's main business is selling servers with Sun Sparc processors running Sun's Solaris operating system. And if Sun's customers defect, or it fails to win new accounts, there is no doubt where the bulk of the lost business will go: to cheaper Intel servers running Linux.
At the low end, the companies most likely to hurt Sun are Dell and Hewlett-Packard. At the high end, they are Hewlett-Packard, IBM and rack system suppliers such as Rackable Systems, whose customers include Yahoo and Google.
Sun must have seen this coming. Dell and other Wintel suppliers have already taken over the workstation market that used to be dominated by Risc/Unix companies such as Sun and Silicon Graphics. They have also taken over the bulk of the entry-level server business with Windows servers, and the web server business with Linux/Apache/MySQL/ PHP (Lamp) boxes. Now Intel systems are starting to arrive at the high end.
The current record-holder for the number of TPC-C transactions is an HP Superdome running Windows Server 2003 on Intel Itanium 2 processors - that is for raw, non-clustered performance, not just price/performance. Linux cannot match that at the moment, but it will.
It is hard to compete with Wintel/Lintel economies of scale. In 2002, Dell's turnover was $34.5bn (£20.7bn), up from $31.2bn, and its gross profit margin was a razor-thin 17.9%. Sun's annual turnover was $12.5bn in 2002, down from $18.3bn, and its gross margin on products and services was 44.6%. Both companies spend roughly the same on R&D - about $450m a quarter - but Dell does not have Sparc, Solaris or Java to support. Who would you back to win?
In the late 1980s, I thought Sun's bet on Risc chips and Unix looked a very good one. We might all be better off if it had been right. By 1995, however, it was dubious and by 1997 it was clearly wrong. Sun has had six years to do something about it. Did it help to spend that time bashing Microsoft instead of focusing on the real threat from Intel and Dell?
Jack Schofield is computer editor of the Guardian