A former government aide has claimed that Microsoft was so upset with the UK government's moves in the direction of open source software that it threatened to pull research facilities and investment out of the country.
Steve Hilton, who was David Cameron's director of strategy until 2012, said that Microsoft was disappointed with the UK government's plans to move to open source.
"Microsoft phoned Conservative MPs with Microsoft R&D facilities in their constituencies and said we will close them down in your constituencies if this goes through," Hilton said, according to a report on Bloomberg. "We just resisted. You have to be brave."
Neither Microsoft nor the government took the opportunity to comment.
It is well known that Microsoft opposed the UK government's open source moves and sought to disrupt its passage onto an open source system.
In 2014, as the government grew close to its final decision on adoption, Microsoft penned a lengthy blog post on TechNet in which it warned citizens and businesses that their political representatives were about to start letting them down.
"You may not be aware, but the UK government is currently in the process of making important selections about which open standards to mandate the use of in future," the firm warned.
"These decisions will likely impact you, either as a citizen of the UK, a UK business or as a company doing or wanting to do business with government.
"We believe very strongly that the current proposal is likely to increase costs, cause dissatisfaction among citizens and businesses, add complexity to the process of dealing with government and negatively impact some suppliers to government."
The move did happen, and it is expected to save the UK money. Microsoft, meanwhile, still has a rather dependable customer in the UK, having been asked by the government to extend support for Windows XP.
That support arrangement has officially lapsed, and its current status is murky.
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