# Office License Key Activation Guide
## Introduction
Activating your Microsoft Office suite with a valid license key is essential to unlock all its features and ensure you’re using a genuine product. This guide will walk you through the process of activating your Office license key on both Windows and Mac platforms.
## Where to Find Your Office License Key
Before beginning the activation process, you’ll need to locate your product key:
1. Retail purchase: Check the product packaging or card that came with your purchase
2. Digital purchase: Look in your email confirmation or Microsoft account
3. Volume license: Contact your organization’s IT administrator
## Step-by-Step Activation Process
### For Windows Users
1. Open an Office Application
Launch any Office application like Word or Excel. If this is your first time opening it, you’ll see an activation prompt.
2. Sign In to Your Microsoft Account
Enter your Microsoft account credentials when prompted. If you don’t have one, you’ll need to create an account.
3. Enter Your Product Key
When asked, type in your 25-character Office license key without hyphens. The system will automatically format it correctly.
4. Complete the Activation
Follow any additional on-screen instructions to finalize the activation process.
### For Mac Users
1. Launch an Office Application
Open Word, Excel, or any other Office app from your Applications folder.
2. Navigate to the Activation Menu
Click on the application name in the menu bar and select “Activate Product.”
3. Input Your License Key
Carefully enter your 25-character product key when prompted.
4. Sign In and Finish
Log in with your Microsoft account and complete the activation steps.
## Troubleshooting Common Issues
Invalid key error: Double-check you’ve entered all characters correctly. The key is not case-sensitive.
Already in use error: Your key might be associated with another device. You may need to deactivate previous installations.
Keyword: office license key
Expired key: Some trial versions expire. Consider purchasing a new license if needed.
## Maintaining Your Activation
Remember that your Office license key typically allows installation on one computer. If you need to transfer your license to a new device, you should first deactivate Office on the old computer through your Microsoft account.
For volume licenses or business editions, consult your IT department about specific activation policies in your organization.