MICRESS® - the MICRostructure Evolution Simulation Software - is a software enabling the calculation of microstructure formation in time and space during phase transformations, especially in metallurgical systems. The software is based on the multiphase-field concept, which has been developed by ACCESS scientists since 1995. MICRESS® allows for simulation of multiphase, multigrain and multicomponent problems in the fields of solidification, grain growth, recrystallization or solid state phase transformations. All these phenomena can be addressed using this versatile and general tool. In the case of multicomponent alloys, the required thermodynamic data can either be provided in the form of locally linearized phase diagrams, or by direct coupling to thermodynamic data sets via a special TQ interface being developed in collaboration with Thermo-Calc AB, Stockholm.