Version: 4.6 beta5 (using KDE 4.6.2) OS: MS Windows when right-clicking on a folder containing 4000 unread and 5000 total Messages, the function "mark all Messages as read" does not work. in smaller folders with up to 900 Mails, it's no Problem. Reproducible: Didn't try
Cannot reproduce here with a folder containing ~12000 mails. It does however send nepomuk-email-feeder and nepomuk into a cpu eating frenzy. And waiting for that to settle takes some time.