An anonymous reader writes: Between 2011 and 2014, the municipality of Pesaro, Italy, trained up its 500 employees to use OpenOffice. However, last year the organization decided to switch back to Microsoft and use its cloud productivity suite Office 365. According to a report from Netics Observatory (Google translation of Italian original), the city administration will be able to save up to 80% of the software's total cost of ownership by going back. The savings are largely due to the significant and unexpected deployment costs. In particular, having to repaginate and tweak a number of documents due to a lack of compatibility between the proprietary and the open source systems translated into a considerable waste of time and productivity. The management estimates that every day roughly 300 employees had to spend up to 15 minutes each sorting out such issues.