Thanks for this - much appreciated. I think I now understand the menu options for reply clean, new etc.
However, I'm still not clear on what the difference between the second and third buttons from the left is - they both seem to do the same thing.
Also I've played about with the customise buttons menu but all I seem to be able to achieve is the addition of an extra button which seems to check for mail - the function of the other buttons seems to remain the same.
I should mention that I am running the free, not the Pro version, in case that makes a difference.
Some further clarification for my thick head would be welcome.