This may seem trivial to most people, but it seems to bother me more than it should when you toss an attachment into the email and it doesn't appear at the top in the attachment window, but instead, inline, amidst all your text that you've so carefully put together.
One of our brilliant developers, Leszek, managed to point out that it was inline because I was sending in "Rich Text" instead of "HTML". Of course, Outlook (and by default Word) is defaulted to send new messages in HTML, which is great, but what happens if you reply to a message that's already in Rich Text?
You can change it with the bar at the top of the window:
I hope that gets rid of some frustration. I know it has for me. I only like to send in HTML format.