Share Excel 2013 Workbooks Saved on Your SkyDrive
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(Optional) Select the Require User to Sign-In before Accessing Document check box if you want the people with whom you share the workbook to have to log into a Windows Live account before they can open the workbook.
Don’t select this check box unless you’re giving your log-in information to the recipient(s) of the e-mail invitation, and don’t give this log-in information to anyone who isn’t in your inner circle or isn’t someone you trust completely.
