It's appropriate to congratulate clients on any of their successes, big or small.
I provided outplacemet to the Vice President of Human Resources for a medical device manufacturing company. Adriana was one of the nicest people on the planet, so I was troubled to see that her career transition was complicated by a failed relationship. In the end she found her dream job—and she deserved it.
04/09/--
Adriana,
I'm delighted to hear about your new job offer. If memory serves, we began this journey on 05.02.20—, nearly two years ago. What a journey it's been!
You did it—you hit one out of the park!
I'm proud of you and grateful to have you as a friend.
Bill