How to Activate Microsoft Office 2021 Pro Plus

This quick guide shows you how to install and activate Office 2021 Professional Plus using the official installer and the recommended web activation method. Follow each step carefully to complete your setup smoothly.

Step 1 — Uninstall Previous Office Versions

1. Open the Start menu and type “Add or remove programs”.
2. Locate all existing Microsoft Office installations.
3. Select each and click Uninstall.
4. Restart your PC after uninstallation.

Step 2 — Install Office 2021

Download and install Microsoft Office 2021 using the installer below.

1. Open the downloaded file and run.
2. Follow the on-screen prompts until the installation is complete.

Step 3 — Activate Office

1. Open any Office app (Word, Excel, etc.).
2. Click your profile icon in the top-right corner and sign out of all accounts.
3. Go to File → Account → Change License.
4. Choose Enter a product key instead and enter your key.
   
5. Select Activate by Phone when prompted to generate your Installation ID.
   

6. Visit the web activation portal: https://aka.ms/aoh
7. Follow this path: Microsoft Product Activation > Microsoft Office > Windows.
8. Select your Office version.
9. Enter the Installation ID currently displayed in your Office Activation Window.
10. Copy the generated Confirmation ID from the website and enter it into your Office app to complete the activation.

Alternative Method — Phone Activation

1. If you prefer to call, visit Microsoft’s Activation Centers page below to find your country’s number. Or use the toll-free number provided beneath your region
   

2. Call the listed number and provide your Installation ID shown on screen.
3. Enter the Confirmation ID you receive to complete activation.