By using Excel, how to find the answer to this question?

A financial consultant has an average of eight customers who contact him each day for consultations for which he receives a fee; assume a Poisson distribution. The consultant's overhead requires that he consults with at least six customers each day in order to cover his expenses. Find the probabilities of 0-10 customer contacts in a given day. What is the probability that he will consult with at least six customers?