In recent years, gravitational microlensing has become one of the key techniques of searching for extrasolar planets. This method has the highest detection sensitivity to exoplanets located in the cold regions of their planetary systemsbehind the "snow line" (1-10 AU), where the gas and ice giants presumably form, according to theoretical predictions. It is sensitive to a wide range of planetary masses-from the Mars-mass objects up to super-Jupiters, brown dwarfs, and stars. Because microlensing effects are independent of the luminosity but depend only on the lens mass, it is the only method that is not biased by the planetary system hosts, allowing discoveries of exoplanets orbiting regular stars, dark lowmass stars, or brown dwarfs. It is also capable to discover exoplanets around white dwarfs or neutron stars. We present here a summary of the contribution of microlensing searches to the exoplanet field from the Optical Gravitational Lensing Experiment (OGLE) project perspective. The OGLE survey is one of the largest long-term photometric