After upgrading to Kubuntu 14.10 with KDE 4.14.1 the folder archive can be used. The documentation linked above is wrong as the folder-archive settings have to be done in the mail account settings as described in my original post. But after that it is possible to right-click a mail and use the "Archive" option.
I don't know if it also works in KDE5 ... -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kdepim in Ubuntu. https://bugs.launchpad.net/bugs/1320516 Title: KMail folder archive unusable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kdepim/+bug/1320516/+subscriptions -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs