after formatting of mac os x lion 10.7.3,how to install microsoft office again

AFTER MBP FAILED TO SWITCH ON ,IT WAS FORMATTED AND OS WAS REINSTALLED AGAIN BY THE SERVICE CENTRE.BUT IN THE NEW INSTALLED OS I HAVE NOT GOT ANY MICROSOFT OFFICE.I MA NOT ABLE TO CREATE POWERPOINT PRESENTATION.

PL HELP ME OUT ...................IS THERE ANY WAY I CAN GET MY MICROSOFT OFFICE PACKAGE BACK WITHOUT SHELLINGOUT ENTIRE MONEY AGAIN.