Write sincerely and clearly. Use a friendly tone that accurately expresses your appreciation.Thank you again for everything that you do. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). I really appreciate that you took so much time to acquaint me with the company. It is no wonder that California. The most important thing is to express your appreciation. Include a complimentary close at the end of your letter before your name. Your hard work, expertise, and ability to overcome challenges were instrumental in its success.