That's about the only use case of exclamation mark I have in professional, corporate communications. Unless we take "professional" to mean "stuff people do to make money" - at which point, well, let's say that the stuff I read when working at small companies was often below what I'd consider baseline in a civilized society. And the spelling! One of the nicer things about working for bigger companies is that people feel they need to put some minimum effort into communicating, and don't just dump their stream of thoughts as fast as they can type.
