I used to love KDE, but they lost me and all the other users where I worked when they stopped supporting NFS home directories. Kmail was one of KDE's greatest assets, and now we are stuck with thunderbird on XFCE.
KDE claimed to be "Enterprise Ready" once ( http://www.kde.org/announcements/announce-2.2.php ), but silently went back on that when they forced the usage of the terrible akonadi and nepomuk with even the most basic components. I don't know of an enterprise setup that doesn't have NFS home directories by default, so I guess KDE is no longer ready for the enterprise?