When to applaud at classical concerts . . . when not to applaud . . . are there rules, and where did they come from--all this makes for an recurrent and robust theme of discussion in the classical world.
Critic Alex Ross has given this some thought, and in this recent speech, gives some history, some personal observations, and some suggestions.
Did you mean for that first link to be a "mail to" one? Maybe not?
I find it so interesting that my university students are the ones that are completely horrified by applause between movements. Those and the much older audience folk. I'm in my 50s, and I've been in this biz for a fairly long time. I'm much more relaxed about it all now than I used to be, as long as the applause isn't jarring (Say, for instance, at the end of the slow movement of Mahler 5 ... *that* would be troubling.)