8/9/2019 Understand the Exchange Server Roles in Exchange Server 2010

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Understand the Exchange Server Roles in ExchangeServer 2010

With Exchange Server Setup, you can deploy servers with specific roles through¬out the

enterprise. Prior to setup and configuration, you need to decide how you will use ExchangeServer 2010, what roles you will deploy, and where you will locate those roles. Afterward,you can plan for your deployment and then roll out Exchange Server.

Exchange Server 2010 implementations have three layers in their architecture: a networklayer, a directory layer, and a messaging layer. The messaging layer is where you define anddeploy the Exchange Server roles. The Exchange servers at the core of the messaging layercan operate in the following roles:

Mailbox Server This is a back-end server that hosts mailboxes, public folders, and relatedmessaging data, such as address lists, resource scheduling, and meeting items. For high

availability of mailbox databases, you can use database availability groups.

Client Access Server This is a middle-tier server that accepts connections to Exchange Serverfrom a variety of clients. This server hosts the protocols used by all clients when checkingmessages. On the local network, Outlook MAPI clients are connected directly to the ClientAccess server to check mail. Remote users can check their mail over the Internet by usingOutlook Anywhere, Outlook Web App, Exchange ActiveSync, POP3, or IMAP4.

Unified Messaging Server This is a middle-tier server that integrates a private branchexchange (PBX) system with Exchange Server 2010, allowing voice messages and faxes to bestored with e-mail in a user’s mailbox. Unified messaging supports call answering with

automated greetings and message recording, fax receiving, and dial-in access. With dial-inaccess, users can use Outlook Voice Access to check voice mail, e-mail, and calendarinforma¬tion; to review or dial contacts; and to configure preferences and personal options.Note that to receive faxes, you need an integrated solution from a Microsoft partner.

Hub Transport Server This is a mail routing server that handles mail flow, rout¬ing, anddelivery within the Exchange organization. This server processes all mail that is sent insidethe organization before it is delivered to a mailbox in the organization or routed to usersoutside the organization. Processing ensures that senders and recipients are resolved andfiltered as appropriate, content is filtered and has its format converted if necessary, andattachments are screened. To meet any regulatory or organizational compliance

require¬ments, the Hub Transport server can also record, or journal, messages and adddisclaimers to them.

Edge Transport Server This serves as an additional mail routing server that routes mail intoand out of the Exchange organization. This server is designed to be deployed in anorganization’s perimeter network and is used to establish a secure boundary between theorganization and the Internet. This server ac¬cepts mail coming into the organization fromthe Internet and from trusted servers in external organizations, processes the mail to protectagainst some types of spam messages and viruses, and routes all accepted messages to a Hub

8/9/2019 Understand the Exchange Server Roles in Exchange Server 2010

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Transport server inside the organization.

These five roles are the building blocks of an Exchange organization. Note that you cancombine all of the roles except for the Edge Transport server role on a single server. One of the most basic Exchange organizations you can create is one that includes a single Exchangeserver that provides the Mailbox server, Client Access server, and Hub Transport server roles.These three roles are the minimum required for routing and delivering messages to both localand remote messaging clients. For added security, you could deploy the Edge Transportserver role in a perimeter network on one or more separate servers.