It’s amazing to me what people mark as urgent in emails. I very, very rarely make use of marking an email “high importance” or “urgent.” There are people who do it for every email they send. Do they really think they’re that important to me? It’s amazing. Unless something significant happening depends on your email being read or responded to, it’s probably not that important. Billing is not one of those things. A red exclamation point in my in box means nothing to me – similar to “asap” (shudder).