No, You do not need to stay online while you are working on Office 365 joins the intensity of Office with the adaptability of the cloud. As a supporter, you are utilizing full Office applications that 'stream' from the cloud and 'wander' over your gadgets. Similarly, as you would buy into administrations, for example, Spotify or Netflix for diversion anyplace, buying into Office 365 methods your own substance goes any place you go. The key contrast is that with Office 365, you don't need to be on the web. Office 365 Home Premium runs fine and dandy without an association. Your docs in SkyDrive can synchronize locally, so you can generally get to them, in any event, when you're detached. For Microsoft 365 download go to www.office.com/setup then go to office setup download then run office.setup/setup and install Microsoft 365.