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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After our review of KDE 4.6, we received a great deal of positive comments, but not all of them were sparkling assessments of KDE’s functionality. For that reason, I have decided to get back to the basics this week with a little how-to guide for KDE 3 users who may be reluctant to switch to KDE 4, Gnome or other desktop users who avoid KDE because of certain usability problems, and anyone who might be new to the software and its unique desktop interface.
One of the new applications introduced with KDE 4 was Okular. KDE 3 had a PDF viewer named KPDF, but Okular aims to be a complete document viewing solution, supporting many different file types. Okular is fast-loading and works in any operating system and desktop environment that can run KDE applications.
The concept of activities is a new feature introduced with
KDE 4.5 is a milestone release that took several months to complete, fixing over 16,000 bugs. While it also 
Keeping any computer system running can be some work. It would be nice if we never had to do any type of maintenance or troubleshooting, but no operating system has reached that point. Many desktop Linux users have server administration experience and are quite comfortable dropping to the command line and tinkering with their system. Not only do they know how to do this, it is the method that makes them comfortable.