Introduction -- Atmospheric Absorption and Scattering -- Radiative Transfer Modeling at Microwave Frequencies -- Microwave Radiance Simulations -- Calibration of Microwave Sounding Instruments -- Detection of Interference Signals at Microwave Frequencies -- Microwave Remote Sensing of Surface Parameters -- Remote Sensing of Clouds from Microwave Sounding Instruments -- Microwave Remote Sensing of Atmospheric Profiles -- Assimilation of Microwave Data in Regional NWP Models -- Applications of Microwave Data in Climate Studies.