I get 100-200 emails a day and keeping track of them is a chore. Not infrequently despite best efforts I have 200-300 in my inbox. I don't like shelling out for applications without being able to try them out, which you can't if you buy from Apple's App Store. However, after reading a review in MacWorld I took the plunge and already loving it. Manually moving emails was always a problem as I could never remember which folder/subfolder I had created or stored similar messages in. With MsgFiler as along as I can remember a word or few letters in the mailbox title I get a short list of options. It seems to learn as I go, so that the appropriate mailbox is more often than not at the top of the list. Simply press 'return' and it gets moved into the appropriate mailbox - quickly. I haven't even looked at some of the other features but already loving it - and I don't write too many favourable reviews.