For example, if you receive an email that says, "I'll be gone for the entire following week and will return to work on August 3rd," you might respond with, "Thank you for the prior warning." "Thank you for the heads-up," is a more informal variant of the statement. When you send a note of thanks or appreciation, it's also acceptable to use the words "thank you" and its variants such as "many thanks," "lots of thanks," or even just "grazie." There are many ways to show your gratitude to others for their efforts. A simple "thank you" can go a long way, but make sure that you express your feelings loudly and publicly so that your colleague knows that you are grateful for what he/she did. Here are some other ideas: give them a gift, call them up to say hi, invite them out for coffee, write a letter, etc.