[This is a follow up on this post]
So yes - he did rescind the permission he had granted Haman to murder the Jews, but no - he did not grant permission to the Jews to proceed with rebuilding the Beis Hamikdash. Not to be discouraged, Mordechai proceeded to gather the Jews during the three day long fast Esther had called for, and taught them the commandments of the Korban HaOmer (barley offering). The book of Esther closes with the victory of the Jews over their enemies, the hanging of Haman and his ten sons, and the celebration by the Jews of the salvation of their enemies’ hands.
Lesson 6: Our Sages teach us that if nothing else is possible violence must be met with violence as a last resort. Sometimes one needs to use his strength and -with G’ds help- gain victory in order to bring peace. But even then it is only to return to our peaceful ways.