See the You Had Me at EHLO blog post for the links below and some good client feedback on these new features.
New and Changed Features
- New Deployment Functionality
- Client Access Server Role Improvements
- Federation Certificates
- Exchange ActiveSync
- SMS Sync
- Server-Side Information Rights Management Support
- Outlook Web App Improvements
- Reset Virtual Directory
- Client Throttling Policies
- Improvements in Transport Functionality
- Permissions Functionality
- Exchange Store and Mailbox Database Functionality
- Mailbox and Recipients Functionality
- Group Naming Policies
- Importing\exporting mailbox data now uses the Exchange Mailbox Replication service
- Hierarchical address book support
- End user direct to Internet Calendar Publishing
- Calendar Repair Assistant (CRA) to fix bad\out of sync calendar items
- High Availability and Site Resilience Functionality
- Big one: Continuous Replication – Block Mode
- Datacenter Activation Coordination Mode Support now supports two node DAGs
- New and improved managment and monitoring\reporting scripts
- Messaging Policy and Compliance Functionality
- Primary & archive mailbox can be in different databases now
- Direct inport & export PST data to primary or archive mailbox, without Outlook
- Delegate access to archive mailboxes
- Improved tagging support
- Discovery improvements: Multi-Mailbox Search preview, data de-duplication, and annotations
- Unified Messaging Server Role Improvements
- UM managment in ECP
- UM reporting, cross forest mailbox migrations, and many others
- Audit Logging Improvements
- Support for Coexistence with Exchange Online
- Support for Multi-Tenancy
Other links:
What’s New in SP1 – EHLO: Changes in SP1
Exchange Queue & A: Focus on Exchange Server 2010 SP1 w/ Henrik Walther
Exchange 2010 SP1 Overview – TechNet Wiki