According to the Buying Solutions statement, the Microsoft deal "could save the tax payer £75m over the next five years"
Mark Taylor, the former chairman of the Open Source Consortium, told ZDNet UK on Thursday that the figure of £75m was only a "notional saving" because "the values that Microsoft attribute to their software [are] obvious nonsense".
"No-one has been able to [find out] what is actually being spent by the government on software licences," Taylor, who also heads up the open-source services company Sirius, added. "It's nonsense giving a notional saving without revealing what the actual cost is."
Taylor also criticised the government's open-source policy document, saying: "It's not an action plan because an action plan has specific actions, a deadline and someone responsible for achieving them." He said that "even a mild move to free software in the UK public sector would save £600m a year".