A cover letter serves as an introduction to your resume. There are two types.Thank you for your service in the military. You are a courageous hero and very much appreciated. Simple steps for how to write an employee appreciation letter to help your employees feel recognized, valued, and indispensable. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). 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. Thank you for all that you do. You and your team's incredible work has made a huge difference to our life's and I am extremely grateful.