Nov 26, 2014 · If the number in cell A2 is equal to 5, the formula returns "OK"; otherwise the function displays "Wrong number". Not equal to. <>. =IF (A2<>5, "Wrong number", "OK") If the number in cell A2 is not equal to 5, the formula returns "Wrong number "; otherwise - "OK". Greater than or equal to. How to Email an Invoice or Credit to Your Customers. Once you have created an invoice for your customer, you can email the invoice to them through Patriot Software.Be sure that you have added each customer’s email address to their “Info” tab in their customer record before sending invoices by email. The QuickBooks email services enable you to send reports, invoices, statements and other transactions through your email to your customers. This article is going to cover all the basics from how to set up your email (webmail or outlook) as well as how to send the invoice through email.