Activate MS Office 2013 without email used to activate it initially?
https://superuser.com/questions/986766/activate-ms-office-2013-without-email-used-to-activate-it-initially
WEBOct 15, 2015 · When activating Office 2013, you must input a product key, but you may also link it to your Microsoft account, so if you ever need to install it again, you don't need to input the product key again, you just need to sign in with your microsoft account and it will automatically activate since the product key is associated with your account.
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