Overview of Exchange 2016 services

During the installation of Exchange Server 2016, Setup runs a set of tasks that install new services in Microsoft Windows. A service is a background process that can be launched during the startup of the server by the Windows Service Control Manager. Services are executable files designed to operate independently and without administrative intervention. A service can run using either a graphical user interface (GUI) mode or a console mode.

All previous versions of Exchange included components that are implemented as services. Each Exchange server role includes services that are part of (or may be needed by) the server role to perform its functions. Note that some services only become active when specific features are used.

The sections in this topic describe the various services that are installed by Exchange 2016 on Mailbox servers and Edge Transport servers. For services that are labeled as optional, you can disable the service if you determine your organization doesn't need the functionality that's provided by the service.

Exchange services on Exchange 2016 Mailbox servers

The following table describes the Exchange services that are installed on Mailbox servers.

Service name Service short name Description and dependencies Default startup type Security context Dependencies Required or optional
Microsoft Exchange Active Directory Topology
MSExchangeADTopology
Provides Active Directory topology information to Exchange services. If this service is stopped, most Exchange services can't start.
Automatic
Local System
Net.TCP Port Sharing Service
Required
Microsoft Exchange Anti-spam Update
MSExchangeAntispamUpdate
Provides Exchange SmartScreen spam definition updates.
Note: On November 1, 2016, Microsoft stopped producing spam definition updates for the SmartScreen filters in Exchange and Outlook. The existing SmartScreen spam definitions will be left in place, but their effectiveness will likely degrade over time. For more information, see Deprecating support for SmartScreen in Outlook and Exchange.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange Compliance Audit
MSComplianceAudit
Provides Exchange auditing features.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Compliance Service
MSExchangeCompliance
Provides a host for Exchange compliance services.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange DAG Management
MSExchangeDagMgmt
Provides storage and database layout management for Mailbox servers in database availability groups (DAGs).
Automatic
Local System
Microsoft Exchange Active Directory Topology
Net.TCP Port Sharing Service
Required
Microsoft Exchange Diagnostics
MSExchangeDiagnostics
Provides an agent that monitors Exchange server health.
Automatic
Local System
None
Required
Microsoft Exchange EdgeSync
MSExchangeEdgeSync
Replicates configuration and recipient data between the Mailbox server and Active Directory Lightweight Directory Services (AD LDS) on subscribed Edge Transport servers over a secure LDAP channel.
If you don't have any subscribed Edge Transport servers, you can disable this service.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange Frontend Transport
MSExchangeFrontEndTransport
Proxies SMTP connections from external hosts to the Microsoft Exchange Transport service on Mailbox servers (the local server, or remote servers).
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Health Manager
MSExchangeHM
Part of managed availability that monitors the health of key components on the Exchange server.
Automatic
Local System
Windows Event Log
Windows Management Instrumentation
Required
Microsoft Exchange Health Manager Recovery
MSExchangeHMRecovery
Part of managed availability that attempts to recover unhealthy components on the Exchange server.
Automatic
Local System
Windows Event Log
Windows Management Instrumentation
Required
Microsoft Exchange IMAP4
MSExchangeIMAP4
Proxies IMAP4 client connections from the Client Access (frontend) services to the backend IMAP4 service on Mailbox servers. By default, this service isn't running, so IMAP4 clients can't connect to the Exchange server until this service is started.
If you don't have any IMAP4 clients, you can disable this service.
Manual
Local System
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange IMAP4 Backend
MSExchangeIMAP4BE
Receives proxied IMAP4 client connections from the from the Client Access (frontend) IMAP4 service. By default, this service isn't running, so IMAP4 clients can't connect to the Exchange server until this service is started.
If you don't have any IMAP4 clients, you can disable this service.
Manual
Network Service
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange Information Store
MSExchangeIS
Manages the mailbox databases on the server. If this service is stopped, mailbox databases on the server are unavailable.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Remote Procedure Call (RPC)
Server
Windows Event Log
Workstation
Required
Microsoft Exchange Mailbox Assistants
MSExchangeMailboxAssistants
Performs background processing of mailboxes in mailbox databases on the server.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Mailbox Replication
MSExchangeMailboxReplication
Processes mailbox moves and move requests.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Net.TCP Port Sharing Service
Rquired
Microsoft Exchange Mailbox Transport Delivery
MSExchangeDelivery
Receives SMTP messages from the Microsoft Exchange Transport service (on the local or remote Mailbox servers) and delivers them to a local mailbox database using RPC.
Automatic
Network Service
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Mailbox Transport Submission
MSExchangeSubmission
Receives RPC messages from a local mailbox database, and submits them over SMTP to the Microsoft Exchange Transport service (on the local or remote Mailbox servers).
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Notifications Broker
MSExchangeNotificationsBroker
Provides Exchange notifications to local and remote Exchange processes.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Net.TCP Port Sharing Service
Required
Microsoft Exchange POP3
MSExchangePOP3
Proxies POP3 client connections from the Client Access (frontend) services to the backend IMAP4 service on Mailbox servers. By default, this service isn't running, so POP3 clients can't connect to the Exchange server until this service is started.
Manual
Network Service
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange POP3 Backend
MSExchangePOP3BE
Receives proxied POP3 client connections from the from the Client Access (frontend) POP3 service. By default, this service isn't running, so POP3 clients can't connect to the Exchange server until this service is started.
Manual
Network Service
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange Replication Service
MSExchangeRepl
Provides replication functionality for mailbox databases in a database availability groups (DAGs).
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange RPC Client Access
MSExchangeRPC
Manages client RPC connections for Exchange.
Automatic
Network Service
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Search
MSExchangeFastSearch
Provides indexing of mailbox content, which improves the performance of content search.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Search Host Controller
HostControllerService
Provides deployment and management services for applications on the local Exchange server.
Automatic
Local System
HTTP Service
Requirerd
Microsoft Exchange Server Extension for Windows Server Backup
WSBExchange
Enables Windows Server Backup to back and restore Exchange server data.
Manual
Local System
None
Optional
Microsoft Exchange Service Host
MSExchangeServiceHost
Provides a service host for Exchange components that don't have their own services.
Automatic
Local System
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Throttling
MSExchangeThrottling
Provides user workload management that limits the rate of user operations (formerly known as user throttling).
Automatic
Network Service
Microsoft Exchange Active Directory Topology
Required
Microsoft Exchange Transport
MSExchangeTransport
Provides SMTP server and transport stack.
Automatic
Network Service
Microsoft Exchange Active Directory Topology
Microsoft Filtering Management Service
Required
Microsoft Exchange Transport Log Search
MSExchangeTransportLogSearch
Provides remote search capability for transport log files (for example, message tracking).
Automatic
Local System
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange Unified Messaging
MSExchangeUM
Provides Unified Messaging (UM) features: allows voice and fax messages to be stored in Exchange and gives users telephone access to email, voice mail, calendar, contacts, or an auto attendant. If this service is stopped, Unified Messaging isn't available.
If you don't use UM, you can disable this service.
Automatic
Local System
CNG Key Isolation
Microsoft Exchange Active Directory Topology
Optional
Microsoft Exchange Unified Messaging Call Router
MSExchangeUMCR
Redirects UM client connections from the Client Access (frontend) services to the backend Unified Messaging service on Mailbox servers.
If you don't use UM, you can disable this service.
Automatic
Local System
CNG Key Isolation
Microsoft Exchange Active Directory Topology
Optional

Exchange services on Exchange 2016 Edge Transport servers

The following table describes the Exchange services that are installed on Edge Transport servers.

Service name Service short name Description Default startup type Security context Dependencies Required or optional
Microsoft Exchange ADAM
ADAM_MSExchange
Stores configuration data and recipient data on the Edge Transport server. This service represents the named instance of the Active Directory Lightweight Directory Services (AD LDS) that's automatically created by Exchange Setup.
Automatic
Network Service
COM+ Event System
Required
Microsoft Exchange Anti-spam Update
MSExchangeAntispamUpdate
Provides Exchange SmartScreen spam definition updates.
Note: On November 1, 2016, Microsoft stopped producing spam definition updates for the SmartScreen filters in Exchange and Outlook. The existing SmartScreen spam definitions will be left in place, but their effectiveness will likely degrade over time. For more information, see Deprecating support for SmartScreen in Outlook and Exchange.
Automatic
Local System
Microsoft Exchange ADAM
Optional
Microsoft Exchange Credential Service
MSExchangeEdgeCredential
Monitors credential changes in Active Directory Lightweight Directory Services (AD LDS) and installs the changes on the Edge Transport server.
Automatic
Local System
Microsoft Exchange ADAM
Required
Microsoft Exchange Diagnostics
MSExchangeDiagnostics
Provides an agent that monitors Exchange server health.
Automatic
Local System
None
Required
Microsoft Exchange Health Manager
MSExchangeHM
Part of managed availability that monitors the health of key components on the Exchange server.
Automatic
Local System
Windows Event Log
Windows Management Instrumentation
Required
Microsoft Exchange Health Manager Recovery
MSExchangeHMRecovery
Part of managed availability that attempts to recover unhealthy components on the Exchange server.
Automatic
Local System
Windows Event Log
Windows Management Instrumentation
Required
Microsoft Exchange Service Host
MSExchangeServiceHost
Provides a service host for Exchange components that don't have their own services.
Automatic
Local System
Microsoft Exchange ADAM
Required
Microsoft Exchange Transport
MSExchangeTransport
Provides SMTP server and transport stack.
Automatic
Network Service
Microsoft Exchange ADAM
Required
Microsoft Exchange Transport Log Search
MSExchangeTransportLogSearch
Provides remote search capability for transport log files (for example, message tracking).
Automatic
Local System
Microsoft Exchange ADAM
Optional