CST Microwave Studio (CST MWS) was the first product of the CST Studio line of software. Initially focussed on the finite integration technique (FIT) transient solver, it was well-suited for antenna and wideband applications. It also included FIT-based Eigenmode and frequency domain solvers. Later finite element method (FEM) and integral equation solvers followed. Finally, in 2006, CST Microwave Studio and the other CST software were integrated into the CST Studio Suite.