If you’ve purchased Office 365 and need to install or reinstall it, simply visit office.com/setup, sign in with your Microsoft account, enter your product key, download the installer, and activate your apps quickly and easily.
Key Highlights on Office 365 on a PC
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Go to office.com/setup or office.com.
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Sign in with your Microsoft account associated with Office 365.
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Enter your product key (if prompted) and select Install Office.
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Download and run the Setup.exe file.
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Follow on-screen instructions to complete installation.
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Once installed, open any Office app and sign in to activate your subscription.
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