Microsoft Exchange Server 2010 Release Candidate helps IT Professionals achieve new levels of reliability with greater flexibility, enhanced user experiences, and increased protection for business communications.

• Flexible and reliable - Exchange Server 2010 gives you the flexibility to tailor your deployment based on your company's unique needs and a simplified way to keep e-mail continuously available for your users.
• Anywhere access - Exchange Server 2010 helps your users get more done by giving them the freedom to securely access all their communications - e-mail, voice mail, instant messaging, and more - from virtually any platform, Web browser, or device.
• Protection and compliance - Exchange Server 2010 delivers integrated information loss prevention, and compliance tools aimed at helping you simplify the process of protecting your company's communications and meeting regulatory requirements.

Go get it @ http://www.microsoft.com/downloads/details.aspx?FamilyID=c6d27da1-ba2c-4570-a491-c0d7b39ede8b&DisplayLang=en.