Working with Japanese colleagues and customers, you calling everyone by their last name with the suffix "-san". In discussions even when the person is not present, Americans still say "Abe-san" since it is how you always address them. Is "-san" only supposed to be used when you are addressing the person? I'm unsure on the correct way to use it.
You should -san the outgroup (including when speaking about them in the 3rd person); you should not -san the ingroup. Whether someone is outgroup or ingroup depends on who you're talking to and can change. There are other options as well. In general, Americans who are rubbing up against Japanese people in a not-specifically-Japanese context get lots of leeway on this question. (One has to be good if one works as a fu…
I'm not sure but in that case it would be Abe-tachi?