They may have problems with sites that don't conform to those expectations. Visitors expect links to be underlined. Never, ever use underlined text on your Web page. Underlining is an important visual cue of a hyperlink. If you need to emphasize text, use different text colors, bold, or italics - never underline it.
Visitors expect consistent link colors.
Unvisited links should be blue . Visited links should be purple . If you deviate from this method, use consistent colors on every page AND use Web safe colors. Visitors must be able to quickly and clearly understand your color scheme. Visitors expect visited and unvisited links to be different colors.