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Instead the machines come without any OS pre-installed. And to get around Microsoft licensing terms that require PCs to ship with an operating system, a copy of FreeDOS is included in the box.

A spokeperson for Dell UK told us: 'Changes in the OEM licensing agreement prompted us to create the n-Series as a means of tracking those systems that we ship without [Windows].'

So, while a 'standard' OptiPlex GX260 will be Windows-based, the OptiPlex GX260n will be the OS-free option.

Dell would not be drawn on whether the n-Series is a response to increased demand for alternative operating systems, or stems from the obligation Microsoft's new licensing system puts on corporates to maintain their OS licences on a more regular basis. However, it doesn't look like the n-Series products will cost any less (and so pass on saving the cost of a Windows licence to customers already in possession of licences for the OS).

Dell made clear that it remains on good terms with Microsoft: 'The relationship between Dell and Microsoft remains strong. Plans to offer future Microsoft products remain on track,' we were told.