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Microsoft is set to finally reveal its Windows 10 software tomorrow - and it could run on everything from your phone to your games console. The firm will show off the software at its Seattle HQ - and is expected to replace its Internet Explorer browser with a new app called Spartan. The first test versions of the mobile phone version of the software are expected to be available for users to download in February, ahead of a release later this year. Experts say the new browser, codenamed Spartan, will be unveiled on January 21st when Microsoft shows off Windows 10 for the first time. It is believed the new browser will look more like Google's Chrome browser, and be faster than IE. 'Microsoft is building a new browser, codenamed Spartan, which is not IE 12 -- at least according to a couple of sources of mine,' said Mary Jo Foley of ZDNET. Thomas Nigro, a Microsoft Student Partner lead and developer of the modern version of VLC a media playing app, claimed on Twitter earlier this month that he heard Microsoft was building a brand-new browser. 'However, if my sources are right, Spartan is not IE 12. 'Instead, Spartan is a new, light-weight browser Microsoft is building.' It is believed Windows 10 will ship with both Spartan and IE 11 to ensure compatibility with all web sites. Microsoft is set to show off the next major version of its Windows software at a January event at its Redmond HQ, where Trident could be revealed. However it has already admitted its release has already been delayed until fall 2015. Chief Operating Officer Kevin Turner told Japanese news service Nikkei on Wednesday that the new system would be released 'early next fall.' Microsoft has not publicly set a firm timetable for the release of Windows 10, but only last week suggested the possibility of an earlier release. The keynote from the day-long event on January 21 will be live streamed. Microsoft CEO Satya Nadella, Windows execs Terry Myerson and Joe Belfiore, and Xbox chief Phil Spencer will be speaking. The event will focus on the 'Windows 10 consumer experience,' a spokesperson confirmed.