Can I use multiple Office 365 subscription keys on the same account
Yes, as long as you are logged in to the same Microsoft account for each key, they can stack on top of existing subscriptions of the same version. Microsoft offers more details, and limitations, on this process here: http://support.office.com/en-us/article/What-happens-if-I-add-another-Office-365-for-home-subscription-plan-to-my-account-e53bde8b-ff38-414c-b2c3-63173a0668e0
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