Hi. I have already successfully converted from mbox to maildir, and it fixed this problem for a little while, but now it's back. My mail client hangs for 5+ minutes when trying to check my email on a particular account, and then gives some error which I cannot remember right now. Other accounts on same server work fine. Restarting exim does not fix the problem, and neither does rebooting the server. I thought this was a file lock problem but have heard that this problem is not supposed to occur with maildir. Is that right? If not, how can I unlock the file? If so, what else could be causing this and how can I fix it?