Search notes:

Registry: HKEY_CURRENT_USER\Software\Microsoft\Office\X.Y

This registry key contains sub keys for the installed Office products or common features. Possible sub keys include:

Determining the application number

The version number of an installed Office application (that is: the X.Y in the registry key) can be found with VBA and the version property of the corresponding application object, for example by typing the following expression into the immediate window: 
? application.version

See also

Determine Office Version without opening an Office application
Registry: HKEY_CURRENT_USER\Software\Microsoft\Office

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