MODI should come with all office versions, you may need to configure it

This is how to check in Office 2003, hopefully it's similar in 2007:

Go to Add/Remove Programs, Microsoft Office 200x, and click change. Then select "Add/Remove Features", and make sure "Choose advanced customization of applications" is checked on the list of Office utilities. YOu'll then be presented a treeview of different items, and MODI is under "Office Tools"