Microsoft Exchange Server 2010 Release Candidate has just been released at the TechNet Evaluation Center:
Microsoft Exchange Server 2010 RC helps you achieve new levels of reliability and performance by delivering features that simplify your administration, protect your communications, and delight your users by meeting their demands for greater business mobility. And when you download the latest software, you're automatically registered to access valuable product resources assembled in one convenient location.
Please review the Microsoft Exchange Server 2010 system requirements before you proceed. Actual requirements and product functionality may vary based on your system configuration.
Source: TechNet Evaluation Center
