I don't know if this topic has been covered but,

How do you (or your company policy) address your customers. First name. Mr./Mrs. Dr. ?

I find myself addressing Dr. (lastname) for Dr.'s I assume they prefer it. But then most customers by first name. I have also noticed my partner (almost afraid to use that term because of what it might suggest)/employee/previous owner of aquired company. I don't know if he realizes it, but he generally addresses wealthy people as Mr. or Mrs. and everyone else as by first name.

When I first started for my first boss at age 16, he insisted I address customers by their first name because he thought that brought us to same level, whatever that means. I personally think it was an ego issue of his own, but;

What do you guys do?