Investing in a CRM (Customer Relationship Management) application to store your customer data is a wise decision. While the expense and headache from moving from whatever system that you are currently using, whether that be spreadsheets or calendars, can show some growing pains, in the end you will find that your investment of time and money will pay off in a streamlines and secure method for tracking your customers and sales. Gone will be the days of "where did I leave that business card" and tedious tracking of sales to determine when you need to preemptively call on your customers.