Dear [Customer's Name], I hope this letter finds you well. We regret to inform you that we have decided to cancel your unfilled order [Order Number] for [Product/Service Name]. After careful consideration and review of our inventory and resources, we have come to the difficult decision of canceling your order. We understand that this might cause inconvenience and disappointment, and we sincerely apologize for any inconvenience caused. There are several reasons that led us to cancel your order. [Briefly explain the reasons such as manufacturing delays, unexpected supply chain issues, or any other relevant factors]. We understand that the cancellation of your order may come as a surprise, and we want to assure you that this decision was not taken lightly. We acknowledge the importance of fulfilling customer orders promptly and having a reliable supply chain. Furthermore, we deeply regret that we were unable to meet these expectations in this particular instance. Furthermore, we value your business and do not take cancellations lightly. However, in rare cases such as this, we are unable to fulfill orders due to circumstances beyond our control. We understand the frustration that you may feel, and we would like to extend an offer of compensation or an alternate solution to mitigate any inconvenience caused. Please contact our customer support team at [Contact Details] or reply to this email to discuss how we can rectify this situation to your satisfaction. Once again, we sincerely apologize for any inconvenience caused by the cancellation of your order. We truly value your business, and we assure you that this situation is not reflective of our commitment to providing exceptional customer service. Thank you for your understanding and cooperation. We hope to have the opportunity to serve you in the future. Sincerely, [Your Name] [Your Position] [Company Name]