Overall, Netics researchers estimated a yearly cost per user of €530.38 over a five-year period for the open source software, 93 percent of which came from deployment costs.
I wonder what kind of cost there can be for free software other than deployment costs --- the paragraph that immediately follows seems to suggest that training of staff is included ind deployment costs:
By contrast, for Office 365, the cost was €197.49 a year. According to the researchers, the lower figure is due to workers' greater familiarity with a Microsoft working environment, and better compatibility with different file formats offered by the proprietary product.