I encountered something odd last week. As of April 22nd I had not yet heard back from one of the graduate schools to which I applied in January (the school shall go unnamed). It was the school I wanted to attend the least, and it was placed on my final list only as a precautionary measure. When I heard in February that I got into my first-choice school I forgot about this other school which was now an afterthought. Skip to last Friday when I realized that I had not yet heard from them, and it was well past the 4/15 acceptance deadline. Curious as I was, I inquired within to find out why they didn't send out a letter or make any attempt to contact me. I was told by the admissions representative that in the first week of April they contacted the students who were offered admission (I wasn't one of them) and not the rejects (this is their protocol, so no apologies), but that they would "try" to get a letter sent out to me. As of the date of this posting they have still not sent out any official correspondence as a rejection of my application.
The poll: should it be mandatory for schools to contact all applicants, or just the ones to whom they offer admission?