15 years ago I worked at a place where there was an entire room of people who were hired to literally do nothing but read your internal mail all day. One of the deployment rules were to make sure they had unimpeded access to everything (except for executives of course). Please don't misinterpret me as suggesting I like the practice.
I can see why people are upset that this technology is being offered, I am too. But I can't see why people are suggesting it's a new low for corporations that have always been doing this.
Your corporate comms are monitored and there is no privacy.