Ron is looking for software that will enable him to keep track of client details and information, and then do a mass email advertisement. Leo says that Customer Relations Management (CRM) is a huge business and there's powerful sales force tools available. But he'll want to be careful not to deluge his customers with what his ISP could consider spam. That's why Leo recommends using a service like Constant Contact or Mail Chimp. Leo likes Mail Chimp for small businesses, and they have a free tier.