Acknowledge people if you're not going to respond timely

People are always busy in the corporate environment. So busy sometimes that they will wait even a week before responding to your email.

I understand how busy people can be but sometimes I think it's just a bit of laziness. How often do you receive an email from someone, know the answer, but don't respond right away because you say to yourself that you'll do it later? Happens all the time.

If you're not going to respond to someone in a timely manner, at least be courteous enough to tell them you'll get back to them later. </end rant>