Exchange Server 2013 Services

Below are the services available on Exchange Server 2013 preview and its basic functionalities. All the services related to Exchange Server are in dependant with Microsoft Exchange Active Directory Topology, if this service fails exchange won't function properly.

Microsoft Exchange Active Directory Topology: Provides Active Directory topology information to Exchange services, If this service is stopped Exchange Server 2013 won't function properly

Microsoft Exchange Anti-spam Update: The Microsoft Forefront Protection 2010 for Exchange Server anti-spam update service.

Microsoft Exchange Diagnostics: Agent that monitors server health

Microsoft Exchange EdgeSync: Replicates configuration and recipient data from the Hub Transport servers to the Edge Transport servers.

Microsoft Exchange Frontend Transport: This service proxies SMTP connections inbound to Hub servers and outbound from Hub servers

Microsoft Exchange Health Manager: Manages Exchange server health

Microsoft Exchange IMAP4: Provides Internet Message Access Protocol service to clients

Microsoft Exchange IMAP4 Backend: Provides Internet Message Access Protocol service to Mailboxes

Microsoft Exchange Information Store: Manages the Microsoft Exchange Information Store. This includes mailbox databases and public folder databases

Microsoft Exchange Mailbox Assistants: Performs background processing of mailboxes in the Exchange store

Microsoft Exchange Mailbox Replication: Processes mailbox move requests.

Microsoft Exchange Mailbox Transport Delivery:

Microsoft Exchange Mailbox Transport Submission:

Microsoft Exchange Monitoring: Allows applications to call the Exchange diagnostic cmdlets

Microsoft Exchange POP3: Provides Post Office Protocol version 3 service to clients

Microsoft Exchange POP3 Backend: Provides Post Office Protocol version 3 service to mailboxes

Microsoft Exchange Replication: The Microsoft Exchange Replication service provides replication functionality for mailbox databases on Mailbox servers in a database availability group

Microsoft Exchange RPC Client Access: Manages client RPC connections for Exchange

Microsoft Exchange Search: Drives indexing and querying of data for Exchange

Microsoft Exchange Search Host Controller: This service provides host level deployment and management services for applications

Microsoft Exchange Server Extension for Windows Server Backup: Enables Windows Server Backup users to back up and recover application data for Microsoft Exchange Server

Microsoft Exchange Service Host: Provides a host for several Microsoft Exchange services

Microsoft Exchange Throttling: Limits the rate of user operations

Microsoft Exchange Transport: Exchange Transport Service

Microsoft Exchange Transport Log Search: Provides remote search capability for Microsoft Exchange Transport log files

Microsoft Exchange Unified Messaging: Enables Microsoft Exchange Unified Messaging features. This allows voice and fax messages to be stored in Microsoft Exchange and gives users telephone access to e-mail

Microsoft Exchange Unified Messaging Call Router: Enables Microsoft Exchange Unified Messaging Call Router features

Other services - IIS Admin Service which handles SMTP and other Web related features and the Net.Tcp Port Sharing Service plays an important role on the Message Transport.

I hope this is informative...