Thanks atolboo for replying
Since my last post I found the following blog:http://aseigo.blogspot.com/2010/05/i-dont-need-no-stinking-nepomuk-right.html
This seems to be by a KDE developer.
After KDE 4.0 was released there were a number of people who called it a "fiasco".
As far as I can understand it this KDE developer is saying that the method of releasing KDE must always be like that as it is the only way of getting a large number of people to try it and to submit error reports.
This would seem to be similar to Debian "testing"; the major difference is that Kde offers no "stable" version
This developer says that PIM is "not good" at present and that nepomuk has almost no function at present.
One of the comments to this blog suggested that KDE should develop apps at the same time so that users could see the benefits that "nepomuk" et al bring to him.
The author of this blog says that there is not enough manpower for this to occur.
I am having second thoughts about KDE ( I was really happy with KDE 3.5; but there is no support now)
Thank you for suggesting that I start a new topic re Kmail.