You may have noticed that the release notes in Exchange 2007 SP1 beta2 pointed to a website where you can download it, issue was that it was Beta 1.
I and others (I assume) complained about this and today it is posted!
Be sure to read it before installing Beta2
- You can perform a clean installation of Exchange 2007 SP1 Beta 2.
- You must prepare Active Directory and domains as a prerequisite when you perform the first installation of Exchange 2007 SP1 Beta 2 in your Exchange organization.
- To deploy Exchange 2007 SP1 on Windows Server 2008, you must install Windows Server 2008 on a computer that does not have Microsoft Exchange installed, and then install Exchange 2007 SP1.
- You cannot uninstall Exchange 2007 SP1. After you install SP1, the only way to remove it is to uninstall Exchange 2007 from the computer, and then reinstall the original release (RTM) version of Exchange 2007.
Microsoft, Exchange Server 2007, Exchanger Server 2007 SP1 Beta 2, Release Notes, Download