welcome to amsn
1) everything is free over here :-)
2) omg, quick, hide that redx question, kakaroto will get a hard-attack :p (just found out there's no such smiley as the tongue smiley :-()
you can find it all over here:http://www.amsn-project.net/wiki/Frequently_Asked_Questions
but I'm in a good mood so: What does the special icon on the right of the buddies mean?
in the buddy list means that the corresponding contact do not have you in his list.
3) not sure about the mobile group, I don't think it's there for me anymore, but I'll leave that answer open...
and about the other tow I wouldn' t know either..
welcome & enjoy as amsn is the best :-)
(always think about using search on the forum or on the wiki page
oh and maybe it's usefull to say which version you are using..