According to OSOR.EU,
All 130,000 desktop PCs at the Directorate General of Public Finance (DGPF) in Paris are to be switched to using the open source Mozilla Thunderbird email client, its Lightning calendar and the open source groupware application OBM.
The French tax authority DGPF is the result of a merger begun in 2007 of the Directorate General of Taxes (DGI) and the Directorate General of Public Accountancy (DGCP). Each uses their own email system, IBM Lotus Notes and Microsoft Outlook and the integration of the two departments prompted a move to new email and groupware software.
The tax authority selected Thunderbird for reasons of cost and management of licenses.
