Hi There, I am having some trouble with business letters in Spanish, as they should sound professional but also warm and friendly at the same time. I would like to say something like this: </span></p> Congratulations for the last ten years of successfully leading the Consejo General. Thank you for your support during this time and I wish you further success in your future endeavours. This is my guess: "Felicitaciones por los últimos diez años de tu presidencia del Consejo General. Quisiera agradecerte por el apoyo que has dado en este tiempo y desearte éxito y buena suerte en tus futuros proyectos." I bet you can improve on this though !