Microsoft is offering a free evaluation version of the Office 2007..
To get your free CD follow the link Get Office 2007 and then click on try or buy office and then on ask for evaluation cd
or directly click on this link Office, you will need a valid Live Id to register...
Note that to use Microsoft Office 2007 beyond 60 days trial period, you need to purchase a valid license for it... But you can always search for a hack to use it further....
Search Google with following keywords at your own risk: hack activate microsoft office 2007 evaluation trial