Overnight Office 12 Beta participants recieved notification that Beta 1 is available for download. I got my copy installed a few days ago and so far I am impressed with the quality compared to the last public DF4 build. This is much more stable and performance is way better. As an indication of the confidence in this build our internal IT operations group (MSIT) are actively pushing this build onto every machine in the company. This is remarkable for a Beta 1 product.
Find out more and sign-up for future Betas at http://www.microsoft.com/office/preview/default.mspx