Helpdesk customers are people who've purchased a product from an organisation. Customers will be created automatically when they create a support ticket by submitting the support form or by sending an email to the configured mailbox.
Click on Customers menu item under Helpdesk menu to reach the customers page as shown in the screenshot below
Shows the names of your customers
Displays the number of tickets associated with the particular customer.
Clicking All displays the list of customers and the number of tickets associated with them as shown in the screenshot above
Clicking 'With Tickets' will display the customers with ticket count greater than or equal to one.
Clicking 'Without Tickets' will display the customers with no tickets.
You can use this filter to quickly open the customers added in particular months.