Twice withing the past 4/5 days I have (purely by chance) noticed an email - for which I had been waiting - on the list of five messages. (bottom right corner) waiting to be added to my inbox. When I went to read the messages only four new ones were there - the one I was waiting for, seen on the 'about to be downloaded' list - was missing. My wife informed me that she had experience a similar problem, eventually solved by locating the email furthe back in history, now attached to another email, and identified by some unexplained arrows. I went in search of similar arrows and found my missing email now attached to an earlier title. What on earth is the purpose of this? If I hadn't spotted the email as I did and as it didn't appear as a recent addition in the inbox, I could not have known it had been sent to me. After the glimpse l'd had of if I emailed the sender to check that he'd sent it. He was puzzled as to why I hadn't replied. I'm a long way from being an expert - scarcely competent in fact - in computing matters, but I am capable of filing my own mail. Please can Thunderbird leave it to me in future?