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Your Microsoft account is a one stop for all Microsoft partner billing information. Manage all your Microsoft billing accounts in one place - Windows 8, Windows Phone, Xbox 360, Office 365, Azure and more.
Manage Microsoft Office billing options
Provides information about managing payment options like adding, editing or removing credit card or PayPal information, managing and cancelling subscriptions, pre-paid codes, and getting refunds.
Office Frequently Asked Questions - Office.com
Office product Where can I use it? Office 365 Home Premium: At home: Office 365 University: For eligible college students, faculty, and staff use only.