Reinstall Office Home & Student 2021 on Another PC
Question details
The user wants to reinstall Office Home & Student 2021 on a different computer but cannot find the installation option or transfer the associated product key.

- Product
- Microsoft Office Home & Student 2021
- Device & OS
- not provided
- Scenario
- Migrating a one-time purchase of Office 2021 to a new computer.
- Observed behavior
- The 'Install' button is missing from the Microsoft account page, typically because the user is signed into an account not linked to the original license.
Ensure you have the login credentials for the exact Microsoft account that was originally used to purchase or redeem your Office Home & Student 2021 product key.
Sign in and Reinstall from the Associated Microsoft Account
Office 2021 licenses are permanently tied to your Microsoft account. You must sign into the correct account to download and install the software on a new PC.
Because Office Home & Student 2021 is a one-time purchase, the product key is only used once. After redemption, the license is managed entirely through the Microsoft account used during the initial setup.
Navigate to the Microsoft account Services & subscriptions page in your web browser.
Log in using the exact Microsoft account (email and password) that redeemed the Office Home & Student 2021 key. Logging into a family member's account will not display the license.
Scroll through your list of active products and subscriptions to find 'Office Home & Student 2021'.
Click the 'Install' button next to the product to download the installer, then run the setup file on your new PC.

Activate Office 2021 on the New PC
Since Office Home & Student 2021 is licensed for only one PC at a time, you may need to complete a telephone activation if internet activation fails on the new computer.
Switch to WPS Office for a Hassle-Free Experience
Tired of strict license limits, account tie-ups, and one-PC restrictions? WPS Office offers a lightweight, highly compatible alternative to Microsoft Office that is free to use and easy to manage across all your devices.
- 1. Download the installer: Visit the official WPS Office website and download the free installer for your operating system.
- 2. Install the software: Run the downloaded file and follow the quick on-screen instructions to install WPS Office.
- 3. Open your documents: Launch WPS Office to instantly open, edit, and save your existing Microsoft Office files with no formatting loss.

Frequently Asked Questions
Can I transfer my Office 2021 product key to a different Microsoft account?
No, once an Office Home & Student 2021 product key is redeemed, it becomes permanently linked to that specific Microsoft account. It cannot be unlinked or transferred to a different account, even for family members.
Why is the Install button missing on my Microsoft account page?
The 'Install' button will only appear if you are signed into the exact Microsoft account that holds the Office license. If it is missing, you need to sign out and log back in with the correct email address associated with the original purchase.
Is Office Home & Student 2021 valid for multiple computers?
No, this specific license is designed for one PC or Mac at a time. If you move it to a new PC, it must be deactivated or uninstalled from the previous machine to comply with Microsoft's licensing terms.




