Office 2007 lets you enter a valid product key to convert your trial version to a full version without reinstallation.

Open any Office 2007 application:

1. Click the Office Button in the upper left corner of the Office applications.
2. Select Options (e.g., Word Options).
3. In the resulting dialog box, select Resources.
4. Select Activate Office and follow the prompts from there. Have your product key ready.

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