What Are The 5 Roles Of Exchange Server?

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

Mailbox Server This is a back-end server that hosts mailboxes, public folders, and related messaging 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 Server from a variety of clients. This server hosts the protocols used by all clients when checking messages. On the local network, Outlook MAPI clients are connected directly to the Client Access server to check mail. Remote users can check their mail over the Internet by using Outlook Anywhere, Outlook Web App, Exchange ActiveSync, POP3, or IMAP4. 

Unified Messaging Server This is a middle-tier server that integrates a private branch exchange (PBX) system with Exchange Server2010, allowing voice messages and faxes to be stored 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-in access, users can use Outlook Voice Access to check voice mail, e-mail, and calendar informa¬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, and delivery within the Exchange organization. This server processes all mail that is sent inside the organization before it is delivered to a mailbox in the organization or routed to users outside the organization. Processing ensures that senders and recipients are resolved and filtered as appropriate, content is filtered and has its format converted if necessary, and attachments are screened. To meet any regulatory or organizational compliance require¬ments, the Hub Transport server can also record, or journal, messages and add disclaimers to them. 

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

Exchange server has5 roles which are:

1. Mailbox

2.Client Access

3. Hub Transport

4. Edge

5. Unified Messaging

Thanks.

These are the five roles in exchange   1.Edge Transport   2.Hub Transport   3.Client Access   4.Mailbox   5.Unified Messaging

the exchange server has main3 layers:

1) network layer

2) directory layer

3) messaging layer

in the messaging layer it performs following operations:

1)mailbox server

2)unified messaging server

3)edge transport server

4) client acess server

5)hub transport server

There are Five Server Roles in Excahnge

1. Mailbox server: to create user mailbox on it

2. Client Access server: The user's can access their email 

3. Unified Communication server: it is not commonly using in every network if you want to use their network Voice messaging service IM's service SMS service then you can install this role in you organization.

4. Hub Transport: This roles is responsible to route user's email inside the organization.

5. Edge Transport: is responsible to route user's email outside the network