In this article, we offer some tips and examples to help you write a great thankyou letter to your manager. Learn how to write an employee appreciation letter with these templates and examples.Download the template for free (PDF or Word). Looking for help on how to write an employee appreciation message? 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. Here's information on when and how to say thank you to your manager, with examples of the best way to relay your appreciation to your boss. I am grateful to have a boss who appreciates and supports the work I do. Here's information on when and how to say thank you to your manager, with examples of the best way to relay your appreciation to your boss. I am grateful to have a boss who appreciates and supports the work I do. Did they retain you as an employee even during a rough economic market?