By default, there is no Office application installed on Elementary OS Luna. We need to install it on our own. There are many Office Suite available for Elementary OS. But for me, Kingsoft Office is the best so far. It much better (in term of user interface) compared to OpenOffice or LibreOffice. The latest version of Kingsoft Office 9.1.0 is now available for download. It still in Beta version but it already usable.
This tutorial is going to show you how to install Kingsoft Office Suite 9.1.0 on Elementary OS Luna. First, download the DEB package of Kingsoft Office Suite.
Now install it using command:
sudo dpkg -i kingsoft-office_184.108.40.20680~a12p4_i386.deb
Once finished, you will see the shortcut listed on Office section. Done.