Ported Software
As with many emulation examples, not all the common KDE programs are guaranteed to work unmodified on KDE on Cygwin due to the complex interaction of all the libraries needed. The open-source nature of KDE and several of the programs running on it, allows some of these shortcomings to be found and circumvented.
The project has ported various Qt and KDE versions, and are considered of beta quality.
Read more about this topic: KDE On Cygwin