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Source: Scott Schnoll’s (MSFT) weblog.

High availability in Exchange 2010 SP1. The following new features for high availability and improvements to existing high availability features are available in SP1:

  • Continuous replication – block mode
  • Active mailbox database redistribution
  • Improved Outlook cross-site connection behavior and experience
  • Enhanced datacenter activation coordination support
  • New and enhanced management and monitoring scripts
  • Improvements in failover performance

Read more at the source.