Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word).Thank you very much. I want to congratulate you personally for completing your year with < company name >. It has been a pleasure working with you. Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. Sending out customer appreciation letters is an excellent way to connect with your clients. Learn how to write a customer appreciation letter here. The following templates provide a starting point for expressing your gratitude in a way that is professional, sincere, and tailored to the sponsor's interests. I am grateful for your generosity.