For information on upgrading to Office 365 please see our Office 2007 page.
When you install Office 2007, you'll be prompted to type or paste in the 25-character Product Key that looks something like this:
Important: Although you aren't required to enter your Product Key at installation, we recommend you do so because it helps to verify that your software is legitimate. You can run your Office 2007 programs up to 25 times before you're required to enter a Product Key. After this grace period, if you haven't entered a valid Product Key, the software goes into Reduced Functionality mode and many features are unavailable.
You can find the product key in one of the following locations:
Sticker on the CD case or other packaging.
Certificate of Authenticity.
Confirmation email message received from an online purchase.
Important: Don't lose your Product Key. Keep the packaging, or write the number down and keep it in a safe place. If you lose your Product Key and have a valid proof of purchase, contact Microsoft support for help.
If you have your Office 2007 product key, you can enter it at www.microsoft.com/software-download/office to download and install Office 2007.
If it's hard to read the product key on your packaging, use this guide to help you tell the numbers and letters apart: