Whenever you copy text into Microsoft Word to be copied and posted on the internet, be sure that you don't press "Enter" anywhere in your message. Everytime you press "Enter" while typing in a Word document the pesky old <o:p></o:p>'s will appear when you copy the text into a message on the Net. I don't know why that is so, but it definitely is so, and we must be gracious and accept it.
I have finally solved the problem in most instances by making sure that when I type in "Word" I start at the very top left margin of the page and keep typing in one long line to the end. I then make sure my cursor can't be placed anywhere on the page beyond the last letter of my message. Then when I copy it into the Message Board, I edit the format properly before sending the message. If I did that diligently, no <o:p></o:p>'s will show up after I send the message. Otherwise the little stinkers will be all over the place.