At it’s event today, Microsoft announced a new build of its Windows 10 operating system will arrive next week via its Windows Insider program. Meanwhile, the first demo of Windows 10 on phone will be made available in February. Windows 10 makes use of universal apps that can run the same code across various types of devices. The apps simply format themselves differently depending on the hardware they’re being used on. For more Windows 10 news as it happens, check out our liveblog. Developing…