ICQ was never that popular to begin with, unfortunately. so I highly doubt thats changed much. My answer would obviously be to download it and see for yourself how you like it. It can do all of those things you asked about. my # is 426742346 if you'd like to give it a test.
What does it mean that some is highlighted in blue and some isn't?
I know I have it turned on. That's not what I asked... I'm just curious why when I go to view it, some parts are highlighted in blue, and other aren't.