€6m: the amount the municipality of Turin hopes to save over five years by switching from Windows XP to Ubuntu Linux in all of its offices.

The move will mean installing the open source operating system on 8,300 PCs, which will generate an immediate saving of roughly €300 per machine (almost €2.5m altogether, made up from the cost of Windows and Office licences) — a sum that will grow over the years as the need for the renewal of proprietary software licences vanishes, and the employees get used to the new machines.
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‘It was a huge risk’: How the end of XP support helped France’s gendarmes embrace Ubuntu – fast

‘It was a huge risk’: How the end of XP support helped France’s gendarmes embrace Ubuntu – fast

Or rather, to the old ones. Another reason for the switch was that the computers Turin uses are quite old…