In the western world, red is an alert color. People think red is the most striking thing and mark important things red.
But in fact 5% of the male population is red-green blind. They cannot see red as bright as the rest does and most of them do not even know.
For example, if you have thin black text on white background, and to emphasize a word you print it in red, 5% of the male people will not notice. Maybe they will if they concentrate hard.
You don't have this problem with blue. Use blue to mark important things.
This is especially a hint to adobe, because I cannot see the bloody links on their crappy website!