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How to Use an Office 2021 Product Key with a Microsoft 365 Trial
Question details
The user wants to install and activate a purchased Office 2021 suite using their product key on a new computer that already has a Microsoft 365 trial pre-installed.
- Product
- Microsoft Office 2021
- Device & OS
- not provided
- Scenario
- Setting up a new PC with an existing or newly purchased perpetual Office license while bypassing the default Microsoft 365 trial.
- Observed behavior
- Because Office 2021 and Microsoft 365 are separate licensing and installation products, the user cannot simply apply the 2021 key to the 365 apps and must perform a specific reinstallation sequence.
Ensure you have your 25-character Office 2021 product key available and know the email and password for the Microsoft account you want to associate with your Office software.
Uninstall Microsoft 365 and Redeem a New Office 2021 Key
Follow this method if your Office 2021 product key is brand new and has not yet been linked to your Microsoft account.
Microsoft 365 and Office 2021 use different installation files. You cannot directly activate the pre-installed Microsoft 365 apps with an Office 2021 key. You must first remove the trial software completely before redeeming your key and downloading the correct version.
Open your device's Settings, navigate to the 'Apps' section, find 'Microsoft 365' in the list of installed programs, and click 'Uninstall' to remove the trial completely.
Open a web browser and go to the official Microsoft product key redemption page (setup.office.com). Sign in with your Microsoft account and enter your 25-character Office 2021 product key when prompted.
Once the key is successfully redeemed, navigate to your Microsoft account's 'Services & subscriptions' page (account.microsoft.com/services). Locate your Office 2021 product in the list and click 'Install' to download the correct setup file.
Install Office 2021 Using an Already Redeemed Key
Use this solution if you have previously redeemed your Office 2021 key and it is already permanently linked to your Microsoft account.
Avoid Complicated Product Keys and Subscriptions with WPS Office
If dealing with separate product keys, uninstalls, and account management seems like too much hassle, try WPS Office. It is a completely free, highly compatible, and lightweight office suite that handles Word, Excel, and PowerPoint files natively without complicated activation steps.
- 1. Download the Installer: Visit the official WPS Office website and click the free download button to get the setup file.
- 2. Install WPS Office: Run the downloaded installer file. The installation process takes just a few clicks and a couple of minutes.
- 3. Open Your Files: Launch WPS Office and directly open your existing Word, Excel, and PowerPoint files—no format conversion needed.
Frequently Asked Questions
Can I use an Office 2021 product key to activate a Microsoft 365 trial?
No. Office 2021 (a one-time purchase) and Microsoft 365 (a subscription service) are entirely separate licensing products. You must uninstall Microsoft 365 and install the dedicated Office 2021 software.
Will I lose my existing documents if I uninstall Microsoft 365?
No. Uninstalling Microsoft 365 only removes the application files. Your personal documents, spreadsheets, and presentations saved on your hard drive or in OneDrive will remain completely safe and accessible.
Where can I find my Office 2021 product key?
Depending on how you purchased it, your 25-character product key can be found on a physical card inside the retail packaging, on your digital receipt, or in the confirmation email sent after an online purchase.
Why is my Office 2021 product key saying it has already been used?
This usually means the product key was already successfully linked to a Microsoft account. Instead of trying to redeem it again, simply log into account.microsoft.com/services with that same account to download your software.
