The company unveiled Windows 10 in September, but will be sharing more at a media briefing that will be streamed online starting 9 a.m. PT (noon ET)
Speakers at the event will include CEO Satya Nadella; Terry Myerson, executive vice-president of Microsoft's Operating Systems group; Joe Belfiore, corporate vice-president of the group; and Phil Spencer, head of Microsoft's Xbox division.
Windows 10 is the successor to Windows 8, as Microsoft is skipping over 9. In September, Microsoft revealed that it will have controls familiar to users of older Windows versions, such as a start menu.
But the start menu will also open tiles similar to those in the current Windows 8, an operating system that many users found hard to learn and navigate.
"It can't be overstated how important this is for Microsoft," Gartner tech analyst Brian Blau told The Associated Press. "They've positioned Windows 10 as the solution to all the problems they created with Windows 8."