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Product Key Issues

Reinstall Office Home & Student 2021 on Another PC

Huda QurayshiHuda Qurayshi Oct 12, 2026 869 views

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.

How to Reinstall Office Home & Student 2021 on Another PC
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.
Before you start

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.

Solution 1Recommended

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.

1
Go to Microsoft Services & Subscriptions

Navigate to the Microsoft account Services & subscriptions page in your web browser.

2
Sign in with the correct account

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.

3
Locate your Office product

Scroll through your list of active products and subscriptions to find 'Office Home & Student 2021'.

4
Download and install

Click the 'Install' button next to the product to download the installer, then run the setup file on your new PC.

Sign in and Reinstall from the Associated Microsoft Account
Missing Install Button: If you do not see the Install button, you are signed into the wrong Microsoft account. Verify past purchases or check other email addresses you may have used.
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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.