Conclusões do estudo da Comissão Europeia sobre a utilização do software livre e o impacto na competitividade: Economic impact of open source software on innovation and the competitiveness of the Information and Communication Technologies (ICT) in yhe EU (pdf).

Resume a BBC:

The report found that in “almost all” cases long-term costs could be reduced by switching from proprietary software produced by firms such as Microsoft.  However, it warned that a move to open source could increase short term costs.