CST MICROWAVE STUDIO® v5.1 is now available for download. This new release contains major new features, in particular the FD solver on tetrahedral grids, the new MOR solver, and 64bit computing for the Transient solver. For CST DESIGN STUDIO™ v3.1 the new powerful cache concept for any 3D simulation should be emphasised here. Results of simulations are stored in a library path, which can be shared between different users or even be transferred to other places. The most significant change in CST EM STUDIO™ v2.1 is the implementation of an electrostatic solver on tetrahedral meshes. Customers are invited to download these upgrades from the support area.