Manual de referencia tecnologica

Exchange Internals – How the Exchange Core Components work together
Let’s begin
Exchange Server 2003 is a complex messaging system with several Exchange core components and services which work together to provide an efficient email system. Exchange Server 2003 highly depends on Microsoft Active Directory and a correctly functioning DNS system but this is out of the scope of this article. The following figure shows the Exchange Server 2003 core services, but there are more Exchange related services like:
• • • •

WWW Publishing Service SMTP Service IIS Admin Service Windows Management Instrumentation...

Figure 1: Exchange core services Please note: The Microsoft Exchange Quota Service, the Microsoft Identity Integration Server and the Microsoft iSCSI Initiator Service in Figure 1 are not Exchange related.

Service dependencies
Most of the Exchange services have dependencies from other Exchange services. We are talking here about other services that depend on this specific service and about other services from which this service is dependent. You can see the dependencies in the properties of the specific service or in the Registry under HKEY_LOCAL_MACHINESystemCurrentControlSet\Services\Servicename. The following figure shows the Dependencies of the Microsoft Exchange System Attendant Service, one of the Exchange Server core services. The Microsoft Exchange

System Attendant Services depends on the Services shown in Figure 2 and two other services – Microsoft Exchange Information Store and Microsoft Exchange MTA Stacks.

Figure 2: Exchange Service Dependencies

Web Services and Exchange 2003
Exchange 2003 uses the Windows Server 2003 Internet Information Services Infrastructure for several Exchange Services like Outlook Web Access (OWA), Outlook Mobile Access (OMA) and services like POP3, IMAP4 and SMTP and extends several services and functions with special Exchange functions. As you can see in Figure 3, Exchange uses some IIS Application pools