Microsoft Exchange Active Directory Topology

Provides Active Directory topology information to Exchange services. If this service stops, most Exchange services are unable to start. This service has no dependencies.

Microsoft Exchange Information Store

Manages the Exchange Information Store. This includes mailbox databases and public folder databases. If this service is stopped, mailbox databases and public folder databases on this computer are unavailable. If this service is disabled, any services that explicitly depend on it fail to start. This service is dependent on the RPC, Server, Windows Event Log, and Workstation services.

Microsoft Exchange Mail Submission

Submits messages from the Mailbox server to Exchange 2010 and 2016 Hub Transport servers. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Mailbox Assistant

Performs background processing of mailboxes in the Exchange store. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Monitoring

Allows applications to call the Exchange diagnostic cmdlets. This service has no dependencies.

Microsoft Exchange Replication

Provides replication functionality for mailbox databases on Mailbox servers in a database availability group (DAG) and database mount functionality for all Mailbox servers. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange RPC Client Access

Manages client RPC connections for Exchange. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Search Indexer

Drives indexing of mailbox content, which improves the performance of content search. This service is dependent upon the Microsoft Exchange Active Directory Topology and Microsoft Search (Exchange Server) services.

Microsoft Exchange Server Extension for Windows Server Backup

Enables Windows Server Backup users to back up and recover application data for Microsoft Exchange. This service has no dependencies.

Microsoft Exchange Service Host

Provides a host for several Microsoft Exchange services. On internal server roles, this service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange System Attendant

Forwards directory lookups to a global catalog server for legacy Outlook clients, generates e-mail addresses and OABs, updates free/busy information for legacy clients, and maintains permissions and group memberships for the server. If this service is disabled, any services that explicitly depend on it fail to start. This service is dependent on the RPC, Server, Windows Event Log, and Workstation services.

Microsoft Exchange Throttling

Limits the rate of user operations. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Transport Log Search

Provides remote search capability for Microsoft Exchange Transport log files. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Search (Exchange)

This is a Microsoft Exchange-customized version of Microsoft Search. Quickly creates full-text indexes on content and properties of structured and semi-structured data to allow fast linguistic searches on this data. This service is dependent on the RPC service.

Microsoft Exchange Active Directory Topology

Provides Active Directory topology information to Exchange services. If this service is stopped, most Exchange services are unable to start. This service is dependent on the Net.Tcp Port Sharing Service.

Microsoft Exchange Anti-spam Update

The Microsoft Forefront Protection 2010 for Exchange Server anti-spam update service. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Mailbox Transport Delivery

This service, running on the Mailbox servers, receives mail items from the Exchange Transport service, submits them to extension modules for processing and commits them into mailbox database. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Diagnostics

Agent that monitors server health. This service has no dependencies.

Microsoft Exchange EdgeSync

Replicates configuration and recipient data from the Hub Transport servers to the Edge Transport servers. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Exchange Search

Drives indexing and querying of data for Exchange. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Health Manager

Manages Exchange server health. This service is dependent on the Windows Event Log service.

Microsoft Exchange IMAP4 Backend

Provides Internet Message Access Protocol service to mailboxes. If this service is stopped, mailboxes on this server cannot be accessed using the IMAP4 protocol. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Information Store

This process controls all of the Store Worker processes. If a DB is dismounted, it is responsible for terminating the associated Store Worker process and if a DB is mounted, it starts a new Store Worker process. If this service is disabled, any services that explicitly depend on it fail to start. This service is dependent on the Microsoft Exchange Active Directory Topology, RPC, Server, Windows Event Log, and Workstation services.

N/A

Each database hosted on a server creates a separate process for each one. This process performs the same work as the 'store.exe process did in previous versions, just on an individual DB basis. This process is dependent on the Microsoft Exchange Information Store service.

Microsoft Exchange Mailbox Assistant

Performs background processing of mailboxes in the Exchange store. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Mailbox Replication

Processes mailbox move requests. This service is dependent on the Microsoft Exchange Active Directory Topology and Net.Tcp Port Sharing services. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Monitoring

Allows applications to call the Exchange diagnostic cmdlets. This service has no dependencies.

Microsoft Exchange POP3 Backend

Provides Post Office Protocol version 3 service to mailboxes. If this service is stopped, mailboxes on this server cannot be accessed using the POP3 protocol.

Microsoft Exchange Replication

Provides replication functionality for mailbox databases on Mailbox servers in a database availability group (DAG) and database mount functionality for all Mailbox servers. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange RPC Client Access

Manages client RPC connections for Exchange. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Server Extension for Windows Server Backup

Enables Windows Server Backup users to back up and recover application data for Microsoft Exchange. This service has no dependencies.

Microsoft Exchange Search Host Controller

This service provides host level deployment and management services for applications. This service is dependent upon the HTTP service.

Microsoft Exchange Service Host

Provides a host for several Exchange services. On internal server roles, this service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Mailbox Transport Submission

This service, running on the Mailbox servers, receives the Submit events, processes the messages by converting them from MAPI to MIME and hands them over to the Exchange Transport service. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Throttling

Limits the rate of user operations. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

Microsoft Exchange Transport

Acts as a middle man and routes messages between Mailbox Transport Submission service and the Front End Transport service. It is identical to the Hub Transport Server role in Exchange 2010 and 2016. Never contacts the mailbox databases directly. This service is dependent upon the Microsoft Exchange Active Directory Topology and Microsoft Filtering Management services.

Microsoft Exchange Transport Log Search

Provides remote search capability for Microsoft Exchange Transport log files. This service is dependent upon the Microsoft Exchange Active Directory Topology service.

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, voice mail, calendar, contacts, or an auto attendant. If this service is stopped, Unified Messaging is not available. This service is dependent upon the Microsoft Exchange Active Directory Topology service.