Do you have an MSDN or TechNet Subscription?
If so, Microsoft announced today that they will make Beta 1 of Exchange "12" available as a CTP to MSDN and TechNet subscribers. I don't have all the details or know if it is being made available to ALL levels of subscriptions, but if you have one and are interested in trying Exchange 12, make sure to sign in to your Technet/MSDN account and see if it is available in your downloads. According to Paul's blog, MSDN subscribers will see it available starting today, while Technet subscribers will see it available as part of their March bits.

You can find more information about Exchange "12" on Microsoft's site
- posted by Ben Winzenz @ 2:39 PM