However, after replying to some emails I noticed that Thunderbird's default behaviour when replying to an email is to place your reply at the bottom of the email.
This confused a few friends so I did a brief Google search and found the solution to setting the reply position on e-mails to the top instead of the bottom.
# In Thunderbird: Go to “Account Settings”
# Select “Composition & Addressing” for the account in question
# Check the checkbox in the Composition group that says “Automatically quote the original message when replying”.
# Once the combo box below is enabled select the option “Start my reply above the quote”
That did the trick. Thanks to this entry on Google: http://tinyurl.com/3kkqde
Very useful tip