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). 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. Thank you for your wholehearted support. You play such an important role in my professional life. In the first sentence, say you're grateful for the employee's amazing work. Specify what they've done recently to impress you. We list down the 30 best thank you messages for boss, which is incredibly thoughtful. Be it a thank you note for guidance, promotion, or a farewell message.