I used this a few years ago and figured it would be gone by now. It's updated to the point of working with beta releases of Thunderbird and Firefox. It's alive and still kicking (HARD!)! I'm impressed!
If you're using Outlook or Outlook Express... May God help your pitiful soul. Mine have only ended in corrupt files, irretrievable files, or messy files. Oh, and Thunderbird is a free desktop based email client, a very similar alternative to Outlook in case you didn't know.