Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word).Thank you for your wholehearted support. You play such an important role in my professional life. To help you succeed in your career with Fairfax County, we provide valuable training and tools, including this guide. In this article, we offer some tips and examples to help you write a great thankyou letter to your manager. Two things: be honest and be specific. Both things help you avoid sounding like you're just sucking up for the sake of getting on the boss's good side.