Microsoft gives all product for free trial thats good thing for all users. They can try and satisfy with product then can makeup their mind to buy.
Here is link to download free trial copy of Office 2007, try this is new package has amazing features.
And if you really want total free office you can get from Sun Microsystems, yes they are the people who introduce platform Independent Java language and bring revolutionary change in high level languages.
Here is link to download open office