What's new in Exchange 2007

• The complexity of the Exchange routing topology has been reduced by building on the existing Active Directory directory service site topology.

• Unified Messaging

• Role based administration model - Edge Transport, Hub Transport, Mailbox, Client Access and Unified Messaging

• SMTP protocol is provided by the Microsoft Exchange Transport service (MSExchangeTransport.exe).

• Only the Mailbox server role can be installed in a failover state. Therefore, if plan to deployed a clustered Mailbox server, you cannot install any other server roles on the same computer as the Mailbox server role.

• The standard license for Exchange 2007 enables you to create up to a five storage groups and to mount up to five databases. The enterprise license for Exchange 2007 enables you to you can create up to 50 storage groups and mount up to 50 databases.

• Only one public folder database can exist on each server.

• You cannot use the Exchange Management Console to change the log file location for remote Mailbox servers. To create storage groups on other Mailbox servers, use the New-StorageGroup cmdlet in the Exchange Management Shell.

• If local continuous replication (LCR) is enabled, you cannot enable circular logging. To make your changes to the circular logging settings effective, restart the Microsoft Exchange Information Store service, or dismount and then mount all of the databases in the storage group.

• When a mailbox size reaches or exceeds a specified storage quota limit, Microsoft Exchange Server 2007 sends a descriptive notification to the mailbox owner. Exchange 2007 allows you to customize the content of these notification messages.

• Exchange Server 2007 includes three Inbox features that provide high availability for Mailbox servers: Local continuous replication (LCR), cluster continuous replication (CCR), and single copy clusters (SCC). The continuous replication features use log shipping to create a second copy of a production storage group. In an LCR environment, the second copy is located on the same server as the production storage group. In a CCR environment, the second copy is located on the passive node in the cluster.

• The complexity of the Exchange routing topology has been reduced by building on the existing Active Directory directory service site topology. Exchange 2007 is a site-aware application and uses Active Directory sites as a basis for selecting which servers to communicate with directly. This means that no additional routing configuration is required when you deploy a pure Exchange 2007 organization.

• Exchange 2007 automatically routes by using minimal hops. Each Active Directory site is considered a hop. Exchange 2007 selects the most direct path between the source and the destination. If a Hub Transport server is unavailable in a site because of temporary network outages, mail is queued at the point of failure.