French phrase
Je vous tiendrai au courant.
Meaning
I will keep you informed.
When to use it
Promises regular updates as information becomes available. Polite and somewhat formal, often used for progress or results.
Example dialogue
Je vous tiendrai au courant.
I will keep you informed.
Merci beaucoup, j'attends votre message.
Thank you very much. I look forward to your message.