Windows Live ID
With a Windows Live ID (also called Microsoft account), you can access all Windows Live and Zune services with a single username and password on your computer or phone.
With your Windows Live ID, you can, for example:
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Download content from Marketplace
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Back up your contacts in Windows Live
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Upload, store, and share pictures and documents on SkyDrive
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Keep track of and lock your lost phone with Find My Phone
To learn more about Windows Live ID and Windows Live services, go to www.live.com/ .