Source: http://www.jonathanboutelle.com/how-to-debug-javascript-in-internet-explorer

Microsoft Office 2007:

The Microsoft Script Editor is normally installed by default with Office 2007, but is not reachable directly from the Start -> All Programs -> Microsoft Office menu.  Instead, you can usually find it by searching for MSE7.EXE on the local drives.  On the machine I am working on now, it is installed in the following location:

C:Program Files (x86)Common Filesmicrosoft sharedOFFICE12