This is the original article from EU commission web site.
In 2004 French police forces switched to use Open Office on all their 90 000 desktops and made ODF format official for their internal exchange media. Firefox and Thunderbird were choosen for browser and mail clients.
In 2008 they installed Ubuntu on the first 5000 desktops, followed by 20 000 Ubuntu installation in 2011 and another 10 000 in 2012, in 2013 they installed another 2000 till mid of the year, so Ubuntu is installed now on more than 37 000 desktops in the police.
According to French police this reduced their total cost of ownership with 40%.