Laut Microsoft und meinem Verständnis, ja.
Zitat von
Microsoft:
A license is also required when the software developer wishes to use elements of the Office 2010 UI that are not provided by those other implementations.
Zitat von
Microsoft:
3. Use Microsoft Foundation Classes (MFC) Ribbon, build it yourself, or use a
third-party component
All of the options in this category require acceptance of the Office UI License terms on this site.