Wikipedia
LiMux – The IT evolution is a project by the city of Munich (third-largest city in Germany) to migrate their software systems from closed-source, proprietary Microsoft products to free and open-source software. The project was successfully completed in late 2013, which involved migrating 15,000 personal computers and laptops of public employees to free and open-source software. LiMux is also the name of the Linux distribution (an Ubuntu derivative) used for the project as the operating system including LibreOffice (and WollMux) as the primary productivity software. The project initially had used OpenOffice, but has since switched to LibreOffice. The city reports in addition to gaining freedom in software decisions and increased security, it has also saved €11.7 million (US$16 million).
The addition of "IT Evolution" stands in contrast to "revolution" as a sharp transition was not planned but a slow yet continuous one.
LiMux is the first Linux desktop distribution certified for industry use ( ISO 9241) by the TÜV IT, Technical Service, Germany. It was first based on Debian, and later changed to Ubuntu, the most popular Debian derivative. Version 3 available from December 2010 is based on Ubuntu 8.10, version 4 available from August 2011 is based on Ubuntu 10.04 LTS, although using KDE Desktop 3.5 and version 4.1 available from August 2012 is also based on Ubuntu 10.04 LTS. The future version of LiMux will be based on Ubuntu 14.04 LTS. The word LiMux consists of Linux and München together.
Similar projects were started with varying success by parts of the Chinese government ( Kylin), the Gendarmerie ( GendBuntu), Amsterdam (Open.Amsterdam), Zaragoza, Spain (AZLinux), Vienna (abandoned Wienux), and Solothurn, Switzerland (abandoned).