Microsoft will charge as much as $200 per Windows 7 PC to deliver a year's worth of OS security updates after it's officially retired in January, according to a company document.

"Windows 7 Extended Security Updates" (ESU), which will add security support through January 2023, was announced in September 2018. At the time, Microsoft said the add-on support would be sold on a per-device basis and in one-year increments for up to three years.

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Although the company admitted that prices "will increase each year," Microsoft did not reveal Windows 7 ESU's costs. Later, Computerworld located a document aimed at partners and the firm's own salesforce that said prices would double each year.

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