Download Microsoft Exchange Server 2007 for evaluation purposes
As you already know, Microsoft has already made their latest version of Exchange - Exchange Server 2007 - available for evaluation purposes download on the Exchange Server 2007 page.
You can now download and install this evaluation software, and the best part is that you can upgrade your server running Exchange Server 2007 evaluation software to full product at the end of the 120 day evaluation period with your product key.
Note that the download includes both 32-bit and 64-bit versions of Exchange 2007, although only the 64-bit version is supported for production environments. The 32-bit version is good for VM testing and labs, plus it is good to have in order to extract and install the Exchange Management Tools on 32-bit client operating systems.
Supported Operating Systems: Windows Server 2003 R2 (32-Bit x86); Windows Server 2003 R2 Standard x64 Edition; Windows Server 2003 Service Pack 1.
E2K7EN32.exe - 686.7 MB
E2K7EN64.exe - 702.7 MB
Note that you need to register in order to download the above files.
Note that the evaluation versions do NOT include the bits for Unified Messaging.