Sign in with the account you use for SkyDrive, Xbox LIVE, Outlook.com, or other Microsoft services.
Sign in with the account provided by your work or school to use with Office 365 or other Microsoft services.
(Or download the demo.)
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You can encrypt Microsoft Office files to help prevent unauthorized people from opening a workbook, document, or presentation. Watch the demo to see how easy it is to set a password to help you control who can open or modify the Office files you create.
How to do it (text version):