Stable releases of the KDE Kolab client.
http://www.kolab.org/download.html#kolab2kdeclient

Note about internationalisation:

We are not publishing corresponding kde-i18n tarballs, 
because they are not as useful as someone would expect.
The reason is that kde-i18n usually contains all languages,
but the proko2 branch only has some updates to English and German.
Packaging of kde-i18n is done differently by GNU/Linux distributions.
A tarball of "kde-i18n-kdepim-en-de-proko2-branch" or so 
could only be used to write over the native package files.
We recommend to start with the native package sources
for your distribution and work from there.

(20060518ber)