"There have been some delays along the way but we are now moving steadily ahead," says Florian Schiessl, manager of the Limux project for the city of Munich.

Since Tuesday this week, the first 100 of the city's 14 000 PCs have been switched from Microsoft's Windows operating system and Office applications to Linux and OpenOffice.

"Today, we are still working in both the Windows and Linux worlds," Schiessl says. "But over the next two years, the Linux world will get bigger, while the Windows world will get smaller."

A full migration to Linux is 'unrealistic', Schiessl adds. Some hardware and software products in the public administration will continue to require Windows and some, particularly in the area of desktop publishing, will continue to require systems from Apple Computer, he says.

By the end of this year, the city of Munich plans to have migrated 200 computers to the open source desktop environment. "Most of these computers are used for relatively simple office communications," he adds.

The configuration is based on Linux Distribution Debian GNU/Linux 3.1, the KDE 3.5 user interface and OpenOffice 2.

The Limux team has established guidelines to help overcome format conversion issues between Microsoft and open source products, according to Schiessl. "With OpenOffice, we do not have a problem opening and reading Microsoft formats and, with most simple documents, we don't have any processing problems," he says. "But, in some cases, there can be format loss, and some documents need to be handled in a special way to avoid format conversion problems. Our guidelines address these issues."

One of the bigger challenges moving ahead, Schiessl claims, will be to migrate some of the public administration's larger departments with more complex processes. "Big departments with specialised processes will be a challenge, but we have a plan to tackle this and expect to achieve our goal of having around 80% of all desktop systems running on Linux by the end of 2008."

Delays in the Limux project began with the dispute over software patent issues, followed by longer than expected negotiations with companies bidding for the contract to provide system configuration and support services. On top of that was a one-year extension of the pilot phase.

"Because of the complexity of this migration project, we decided to have a very thorough pilot phase," Schiessl says.

He declines to comment on the decision by the city of Bergen, Norway, to delay its Linux desktop plans by two years, largely for lack of detailed information about the decision.

Last month, the Norwegian city decided to focus on building an e-government portal first, and later migrate its Windows-based systems to a Linux environment.

Vienna is another big European city with ambitious plans to roll out Linux in its public administration.