this is the online outlook.com that was converted from Hotmail ?
when you print do not use the print from the internet browser.
there should be a print button ON THE WEBPAGE ITSELF
click that when the email is open and you should get a much better print copy
I just checked and they seem to have moved it a bit. It is no longer an icon but it is a selection under actions or in my case it was under the 3 little dots showing more actions as in the picture below