Not using underline in your links is an amateur mistake if your designing for an older demographic. Younger people know how to follow links if they don’t have an underline however older people need the hand holding. If you’re designing for an older demographic and don’t include underline links it really shows your ineptitude for usability. It sort of says you don’t understand your audiences desire for an easy to use web experience.
We are not talking about underlines.
2 reasons I can think of: 1. I sometimes don’t because i forgot about it!! 2. Not good for some usability… you can’t use the keyboard for navigation if outlines are none. http://www.456bereastreet.com/archive/200905/do_not_remove_the_outline_from_links_and_form_controls/
Really. I don’t know no one who browsing sites with TAB and without mouse.
But outlines looks really ugly. Even more if they are white on black 
2 reasons I can think of: 1. I sometimes don’t because i forgot about it!! 2. Not good for some usability… you can’t use the keyboard for navigation if outlines are none. http://www.456bereastreet.com/archive/200905/do_not_remove_the_outline_from_links_and_form_controls/Really. I don’t know no one who browsing sites with TAB and without mouse.
But outlines looks really ugly. Even more if they are white on black
Agreed. I’m surprised some people don’t use it even if it bothers with their design.. Though sometimes, outlines look fine.
I use it. 
Personally, I think it looks even uglier when the border shows that the button is actually bigger than I make the user think.
