，文章要包含详细的步骤和说明，并包含常见问题解答部分

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Office 365 Product Key Activation Guide

Activating your Office 365 product key is a straightforward process that unlocks the full suite of Microsoft Office applications. Whether you’ve purchased a new key or are renewing an existing subscription, this guide will walk you through the steps to successfully activate your Office 365.

Step-by-Step Activation Process

1. Locate Your Office 365 Product Key

Your product key is typically found in one of these locations:

• Email receipt if purchased online
• Card or sticker inside physical packaging
• Digital retailer account if bought from an online store

2. Sign In to Your Microsoft Account

Visit office.com/setup and sign in with your Microsoft account. If you don’t have one, create a new account.

3. Enter Your Product Key

Type your 25-character Office 365 key in the provided field. The key should look like this: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

4. Download and Install Office 365

After verifying your key, follow these steps:

1. Click “Install Office”
2. Run the downloaded setup file
3. Follow the on-screen installation instructions

5. Activate Your Installation

Once installed:

• Open any Office application (Word, Excel, etc.)
• Sign in with your Microsoft account if prompted
• Accept the license agreement

Common Activation Issues and Solutions

Problem: “Product Key Already Used”

Solution: This typically means the key has already been activated. Try signing in with the Microsoft account originally used to activate it.

Problem: “Invalid Product Key”

Solution: Double-check for typos. If the error persists, contact Microsoft Support with proof of purchase.

Problem: Installation Fails

Solution: Try these troubleshooting steps:

1. Restart your computer
2. Disable antivirus temporarily
3. Use the Office Uninstall Support Tool to clean previous installations

Frequently Asked Questions

Q: Can I use one Office 365 key on multiple computers?

A: It depends on your subscription type. Personal subscriptions typically allow installation on 1 PC/Mac and 1 tablet. Family plans allow up to 6 users.

Q: What if I lose my product key?

A: If you purchased digitally, check your email or retailer account. For physical purchases, contact Microsoft Support with proof of purchase.

Q: How long does activation take?

A: Activation is usually instant once you enter a valid key and complete installation. In rare cases, it may take up to 24 hours.

Q: Can I transfer my Office 365 license to another computer?

A: Yes, first deactivate Office on the