As a follow-up to our Exchange 2007 SP1 announcement, I wanted to let you know that we have finished preparing two additional ways in which you can experience Exchange 2007 SP1 Beta 2:
SP1 Hosted demo: please visit https://signmeup.exchange2007demo.com/exchange2007demo/ to register for an online trial account that is pre-populated with sample messages, calendar appointments and a voice mail to enjoy the rich experience through Outlook Web Access, Outlook, or an Exchange ActiveSync compatible device.
A Virtual Hard Disk (VHD) pre-configured with Exchange Server 2007 SP1 Beta 2 for use with Microsoft Virtual PC or Microsoft Virtual Server (both available as free downloads): Exchange Server 2007 SP1 Beta 2 (VHD) that you can download and evaluate for free in your own environment without the need for dedicated servers.
Microsoft, Exchange Server 2007, Exchange 2007 SP1
Source:? Exchange Team Blog