Office 12, aka Office 2007, is the next version  of Office that should be
released next year and is currently available as a public beta. The expiry
date for the beta is at the end of the year. If the product has expired,
then it is a copy of the alpha release or beta 1. Neither of which are
public trials. Those who received these signed an NDA promising not to
distribute.

The public beta is available from one of the Microsoft websites.