Version: 1.13.2 (using KDE 4.4.2) OS: Linux Installed from: Archlinux Packages 1. have an dIMAP account with data 2. delete this account in settings 3. click ok, and wait until the dialog closes and all data is deleted -> KMail will try to refresh the folder structure and complains about missing folders, that belong to the cached IMAP data. Maybe thats related: when you turn off the option to look for new mail every couple of minutes, that setting will be active on next KMail start instead of beeing active after closing the settings dialog. So it still keeps refreshing...
Thank you for taking the time to file a bug report. KMail2 was released in 2011, and the entire code base went through significant changes. We are currently in the process of porting to Qt5 and KF5. It is unlikely that these bugs are still valid in KMail2. We welcome you to try out KMail 2 with the KDE 4.14 release and give your feedback.