  (Sub-)mm interferometry is the most favorable technique to investigate the
earliest stages of massive star formation. I will outline general applications
in that field and discuss results of different sub-topics (hot core chemistry
and massive molecular outflows). Furthermore, recent data obtained with the
Submillimeter Array will be shown to present the unique capabilities of this
new instrument. Finally, I will give a short outlook on the main physical
topics of massive star formation to be tackled with (sub-)mm interferometry
within the next decade.
