Version: (using KDE 4.0.80) Installed from: Ubuntu Packages If you have no diskspace left then kontact can corrupt (destroy) it`s own database.
*** This bug has been marked as a duplicate of 160980 ***
Could also be a duplicate of bug 65571 or a similar POP3 bug (can't find the bug number right now).
KMail looses accound data as a side effect.