Using a Linux operating system might save money on servers, but most enterprises shouldn't expect to see the same cost savings if they switch their Microsoft Windows desktops over, a report from Gartner said Wednesday.

In the latest of a series of Linux-vs.-Windows papers to be published by research companies recently, Gartner said that while many servers are dedicated to running a single application, and can therefore be replaced quite easily, the desktop environment is more difficult. Most workers use many different applications, all of which would have to be replaced or rewritten, it said.

Last week, Microsoft released benchmark results that, it said, showed that Linux on the mainframe performed poorly against Windows 2003 in terms of value for money.

Earlier this week, Forrester Research released a Microsoft-commissioned report saying that creating and maintaining a custom Web-based application with Java and Linux is almost 40% more expensive than using Microsoft software.

This rash of announcements is greeted without great surprise by Linux advocates.

"We heard (early this year) that Microsoft was going to fight against Linux with paid studies, so this doesn't surprise us," Christian Egle, a spokesman for SuSE Linux said Wednesday.

"They said they were going to fight the argument that Linux brings down the total cost of ownership, by initiating studies to show that (their products) are better and cheaper," Egle said.

"These studies are being greeted with a pretty good round of scepticism, and I think most people see it for what it is. And Microsoft is obviously worried about something, if they're throwing a whole lot of money at it," Joe Eckert, SuSE's vice president of corporate communications, said.

However, Michael Silver, a Gartner vice president and research director and one of the report's four authors, insists this research was not paid for by Microsoft and that the report is balanced.

"It's very logical that there are places that make sense for Linux and others that don't. Enterprises are often trying to make an all-or-nothing decision and that doesn't always make sense," he said.

Gartner choose to do this research because it tries to keep ahead of the curve on new technologies as they become popular and to see what the total cost of ownership of each will be, he said.

The IDG News Service is a Network World affiliate.