Lost customers are those who have made a purchase at some point but have not returned for a long time—much longer than their usual purchasing cycle. In RFM analysis (recency, frequency, and monetary value), they typically score low on all three metrics.

When a customer is considered lost depends on your business: a grocery store is not the same as a furniture store.

Why does it matter?

Looking at this group helps you understand why your customers are leaving. Did they make a one-time purchase? Did they have a problem with an order? Did they come in because of a one-time promotion?

It also helps you decide how much to invest in them. Not all lost customers are worth the same effort: it’s best to prioritize those who were most valuable and try low-cost strategies with the rest. Additionally, cleaning up your list of contacts who no longer respond helps maintain your email deliverability.

Story mode

An online sports store reviews its customer base and finds thousands of customers who haven't made a purchase in over two years. Instead of sending them the usual newsletter, it launches one final reactivation campaign with a clear message and a specific benefit.

A group makes another purchase and is reactivated. For those who do not respond, the store reduces the frequency of emails so as not to affect its metrics.

How to Use It with Data4Sales

Data4Sales helps you identify and prioritize your lost customers:

• The RFM segments and the customer lifecycle, updated daily, show you who they are and how much they were worth.
• Orbis Copilot tells you in natural language what customers were buying and through which channel.
• Active campaigns or reactivation flows via WhatsApp, email, or SMS.
• Attribution with a control group shows you whether the reactivation generated actual incremental revenue.

Related terms

• Inactive customer
• Churn or cancellation rate
• Reactivated customers
• Recovered customers