Microsoft is rolling hard to wash the taste of anything Vista out of their customer's mouths. Below is an excerpt of Whats New as well as a link to download the Beta

http://www.microsoft.com/exchange/2010/en/us/trial-software.aspx

Exchange 2010 offers a simplified approach to high availability and disaster recovery coupled with enhanced maintenance tools to help you achieve new levels of reliability to deliver business continuity. Building on previous investments in Continuous Replication technologies in Exchange 2007, these investments:

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Remove the need to deploy complex and costly clustering and third-party data replication products for full-scale Exchange redundancy
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Automate mailbox database replication and failover with as few as two servers or across geographically dispersed datacenters
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Maintain availability and fast recovery with up to 16 Exchange-managed replicas of each mailbox database
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Limit user disruption during mailbox moves between e-mail servers, allowing you to perform migration and maintenance activities on your schedule, even during business hours
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Guard against lost e-mail due to Transport Server upgrades or failures, through new built-in redundancy capabilities designed to intelligently redirect mail flow through another available route

Learn More about High Availability and Disaster Recovery

Lowering the burden on your help desk and yourself is a key way in which you can accomplish more and reduce costs. This motivated investments in new self-service capabilities aimed at enabling users to perform common tasks without having to call the help desk. With this functionality you can:

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Allow users to update their contact information and track delivery receipt information for e-mail messages, for example, without IT assistance
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Offer an easy-to-use Web-based interface for common help desk tasks
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Utilize the new Exchange Roles-based Access Control model to empower specialist users to perform specific tasks – like giving compliance officers the ability to conduct multi-mailbox searches – without requiring administrative control

Learn More about Administration
Anywhere Access

Enhancements in the latest release of Exchange provide your users access to all of their communications from a single location while making it easier for them to collaborate with each other and their business partners. These enhancements include the ability to:

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Offer your users a premium Outlook experience across the desktop, Web, and mobile devices, including OWA support for browsers like Apple Safari and Mozilla Firefox
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Unify access to e-mail, voice mail, instant messaging, and text messages enabling your users to choose the best way to communicate no matter where they are
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Add native support for virtually every mobile device, including a premium experience with Windows Mobile, through Exchange ActiveSync
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Share free/busy information with external business partners for fast and efficient scheduling, choosing the level of detail you wish to share

Exchange 2010 adds new productivity features that help your users easily organize and prioritize the communications in their inboxes. Your users will experience:

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An enhanced conversation view that streamlines inbox navigation by automatically organizing message threads based on the natural conversation flow between communicating parties
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MailTips that inform your users, before they click send, about message details that could lead to undeliverable or mis-sent e-mails, like accidentally sending confidential information to external recipients, reducing inbox clutter, extra steps, and help desk calls

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