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. Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. An employee appreciation or thank you letter is a formal message from an employer that recognizes the former's contribution to the company they work for. Sending out customer appreciation letters is an excellent way to connect with your clients. Learn how to write a customer appreciation letter here. Get your students excited for Thanksgiving break with these heartfelt thankfulness letters and cards! Encourage your students to express gratitude. Sending out customer appreciation letters is an excellent way to connect with your clients.