Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word).Your hard work, expertise, and ability to overcome challenges were instrumental in its success. Thank you for your dedication to excellence. Sample Letter for Long Service​​ Dear Robin, I can't believe you've been with us for 10 years now! The message of appreciation should stand alone. Be brief, warm, and sincere. Thank-you letters should always be written in a personal, down-to-earth voice. Learn how to write an employee appreciation letter for different circumstances, work relationships and company cultures using our templates and examples. Your employees work hard.