How many people are testing Microsoft’s new operating system? How about 1.7 million people have signed up to be early testers. Windows 10, is a big deal for Microsoft and loyal fans who want something better than the operating system they got with Windows 8, a disappointment. At a company event today, Windows 10: The Next Chapter, executives shared what to expect with the new software when it is made available. They discussed a new browser that is coming, the price structure that will include free versions for some, and even the use of holograms for virtual workspaces.