Microsoft have released the beta version of MS Office 2010 and it is available for download and that too for free.It was first released to technet and MSDN subscribers and now it is made available to public.
The beta version is available in English, Chinese, French, German, Japanese, Russian and Spanish and is valid till October-2010. Size of installation package is something around 700 MB.
You can download this from official Microsoft Site. All you will require is a live id and Password to get your free beta Product key.