Applescript and outlook 2011 reply email keeping original body

Question

Hi,
I need help with an applescript.
The idea is...
I receive an email on Outlook 2011, and I can just run this applescript and it will create a response based on the original mail, with a predefined message.
Right now it's working up to the point of creating a reply, adding the message and sending it. However, it is NOT keeping the original content of the message. that I'm replying to.
Can someone help me with that part?
I've tried many stuff and someone else helped me getting this one to work:
tell application "Microsoft Outlook"
    set replyToMessage to selection
    if (replyToMessage is "") then -- nothing selected, don't continue
        log ("NOTHING SELECTED!")
        return
    end if
    set replyMessageSubj to subject of replyToMessage
    set replyMessage to reply to replyToMessage without opening window
    if has html of replyMessage then
        log ("HTML!")
        set the content of replyMessage to "<p>Working on HTML</p><br />"
    else
        log ("PLAIN TEXT!")
        set the plain text content of replyMessage to "Working on plain text"
    end if
    send replyMessage
end tell
Many thanks for the help.

Answer 1

That's exactly what I needed to understand.
The final one is like this in case someone else needs it:
tell application "Microsoft Outlook"
    set replyToMessage to selection
    set mymessage to "Aqui se trapeo con jerga"
    set OldContent to content of replyToMessage
    if (replyToMessage is "") then
        log ("NOTHING SELECTED!")
        return
    end if
    set replyMessageSubj to subject of replyToMessage
    set replyMessage to reply to replyToMessage without opening window
    if has html of replyMessage then
        log ("HTML!")
        set the content of replyMessage to "Hello World<br> This is an HTML test<br><br><br><hr>" & OldContent
    else
        log ("PLAIN TEXT!")
        set the content of replyMessage to "Hello World<br> This is a plain text test <br><br><br><hr>" & OldContent
    end if
    open replyMessage
end tell
Many thanks for the help Llessur999!!