Version: (using KDE 4.1.0) Installed from: Unspecified I have KDE 3.5.9 and 4.1rc installed in parallel. There is nothing that helpsusers to migrate their 3.x settings (mails/news/....) from the 3.x to the 4.x world. Some kind of migration tool/script or documentation for whole KDE is required.
KMail has update scripts which take care of upgrading the config (minus some bugs like dictionary settings). Sometimes these upgrade scripts are not run correctly though, see bug 165320. As for opensuse, they change the KDE home directory from .kde to .kde4, that is why no config is migrated there. That is an opensuse problem however, and you should report a bug against them. For import/export of mails from KMail, there's another wish somewhere, I can't find it right now.