'Cleaned up'

Mr Jones said the firm had built a "brand new service from the ground up". But Matt Cain, an analyst at the tech consultants Gartner, played down the suggestion of a major leap forwards.

"Outlook.com represents reverse-consumerisation - taking a ubiquitous business tool and recrafting it for the consumer market," he told BBC.

"There really is no new technology here - the filtering tools have been around for some time as well as the social network integration.

"What is new is the cleaned up user interface, and the marketing spin, and the tight integration with office web apps and Skydrive, and the forthcoming integration with Skype."

Microsoft is offering the service in a "preview" mode for the time being and has not announced an official release date.

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