Exchange Server 2010 offers lots of highly availability (HA) feature that ensures availability of messaging services. HA
can be achieved by deploying multiple Hub Transport, Edge Transport and
Client Access servers and placing the additional servers within the Active Directory sites, which in turns ensure availability if any of the Exchange Server 2010 roles fails.
· Deleted Item Retention allows users to recover their deleted items or an entire folder from the Microsoft Office Outlook.
· Deleted Mailbox Retention allows administrators to restore entire mailbox if accidently deleted without restoring it from the backup.
· Database Availability Group (DAG) creates one copy of a database that is hosted and active on another member server. Continuous replication maintains copies of databases on each Exchange Server.
· Archive Mailboxes are used to store users old messages to comply company policies or legal requirements.
· Message Retention Policy is applied when retention period is reached and messages are processed based on the actions defined in the Message Retention tags.
· Multiple Mailboxes databases,
configuring storage appropriately and distributing users across these
databases can significantly reduce the impact of failover.
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