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Not only is Windows 8 still in development, metrics on how you use the computer are important to help make Windows better. SpyNet is part of Windows Defender and Microsoft Security Essentials -- an anti-malware solution in-built into Windows 8 -- to protect you from malicious content on the web which can make your PC or tablet unsafe.
If something goes wrong -- and lets face it, on Windows it often does -- the operating system can check online for solutions to problems to see if it can fix things without the need for user intervention, such as if an application crashes or is not compatible. Also, if your device has a GPS in-built into it, it can acquire your location and display content based on where you are, such as weather or news.
Windows Live ID's can be linked with Windows 8 to synchronise some of your content, files, favourites and bookmarks across computers to ensure that you always get a seamless experience, regardless of whether you are using a friend's PC or tablet. You can literally jump from one machine to another, as though it is the same machine, by keeping some of your basic information and settings stored in the cloud.