View the list of Sample Business Letters Thanksgiving Letter to Customers Disclaimer: Be aware that some of these sample letters have legal, financial, or other implications. If you are not sure about the use of any letter, consult with an appropriate professional first. Thanksgiving Letter to Customers Dear We are always happy when Thanksgiving is approaching, because this wonderful holiday affords us the opportunity to thank all of our friends. This past year has been good to us, and we thank you for your patronage and for allowing us to be of service to you. HAPPY THANKSGIVING!