When KDE 4 was first released, it was met with both hope and dismay, depending on the person you asked. Some loved everything from the new interface to the improved functionality. Others called it a significant step, but one in the wrong direction.
Those purists still love KDE 3.5, and many of them continue to use the supported version of it called Trinity Desktop Environment. Others, however, mainly just preferred the KDE 3.5 look over the current Plasma Air appearance. If that is the case, Plasma gives you the flexibility to make your KDE 4 desktop look like KDE 3.5.
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When KDE 4.0 was released, it was clear that it was not finished and not ready for production. By version 4.2, the completely redesigned and recoded desktop environment was starting to regain the stability and depth that many loved about KDE 3, while also adding new features that make KDE a unique and rewarding desktop software compilation.
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Dolphin is KDE 4′s default file manager, and is a departure from KDE 3, which relied on Konqueror for file management. Unlike Konqueror, which functions as a web browser and many other things, Dolphin is specifically used for file management. If you prefer to use Konqueror or any other file manager, you can change the KDE settings to use it by default.