The biggest computing and networking companies in the world are getting bigger - and former partners are now fierce rivals. Is tech's new strife good for customers?

The largest technology companies in the world are at war.

Sure, the executives who run Cisco, Hewlett-Packard, IBM, Oracle, and others appear to play nice: Cisco touts the "regular dialogue" between its CEO, John Chambers, and IBM's chief executive, Sam Palmisano. Ann Livermore, an HP executive vice president, spoke at Oracle's annual customer event in October and extolled the virtues of their partnership. And because large customers buy software, gear, and services from all the tech giants, their staffs must work together to get computers and networks up and running.

Don't be fooled by the handshakes and air kisses. Increasingly these titans are invading one another's territories in a bid to grab as much of the $1.5 trillion in projected 2010 worldwide corporate tech spending as they possibly can -- and it's going to get bloody.

Customers have cut their tech purchases, and when they do loosen their purse strings, they are buying software and services that help them run their systems more cheaply. To boost sales and profits in this low-growth environment, technology companies are bulking up by buying companies in entirely new businesses.

The endgame? Each aims to steal business from rivals by promising customers one-stop shopping for most, if not all, of their computing and networking needs. More