According to the latest studies in germany (companies not affiliate with M$).

But what is the TCO (Total Cost of Ownership)?? The table below show You the main differences between
Free Softwares and Proprietary Softwares TCO.

 Free Softwares and Proprietary Softwares TCO.
All Costs = TCO Free Softwares Proprietary Softwares
Buy the software 0 $
Configuration - installation $ $
Deployment $ $
Training $ $
Curative maintenance $ $
Preventive maintenance $ $$
Corrective maintenance $ $$
Adaptative maintenance $ $$
Evolutive maintenance $ $
Respect standards $ $$$
Interoperability $ $$
Hardware compatibility $ $
Security: resisting to intrusions $ $$$
Security: resisting to virus $ $$$
Necessity to replace
regurly equipmeent
$ $$$
Dependency to a company $ $$$

Source : Eikonex - Free software

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