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Update Microsoft Office for Mac OS X using the Microsoft AutoUpdate application.

Step-by-step guide

To update Microsoft Office for Mac OS X, do the following:

Make sure you have a working Internet connection.
Open any Microsoft Office application (Word, PowerPoint, Excel, etc.). You do not have to do this for each program; Microsoft Autoupdate will download updates for all Office products.
Click Help > Check for Updates.
Click Check for Updates. Software updates appear in the Microsoft AutoUpdate window.
Click Install.
More updates may still be available. Repeat steps 1 through 6 until the Microsoft AutoUpdate window says, "There are no updates available for your Microsoft software at this time."
When you are done, click on the AutoUpdate menu and select Quit.

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Note: You do not have to do this for each Microsoft Office Application. Microsoft Autoupdate will download updates for all Office products regardless of the program you opened for step 2 above.