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The Exchange 2013 Diagnostic Console contains the following panels:
The components of the Directory Services panel indicate how Exchange 2013 interacts with directory services. This information includes:
AD
Shows the status of the Active Directory (AD) servers used by this Exchange 2013 server. It will check the following conditions (non-edge Exchange servers only):
DNS
Shows the status about the Domain Name System (DNS) servers in use by this Exchange 2013 server. It will check the following conditions:
The components of the Server Roles panel shows the Exchange 2013 roles that are installed. This information includes:
MBX
Shows whether the Mailbox role is installed on this Exchange 2013 server. The Mailbox role stores mailbox data, performs processing and rendering for client connections proxied by the Client Access server, and handles Unified Messaging requests. Mailbox servers can be organized into back-end clusters that use database availability groups (DAGs).
CAS
Shows whether the Client Access role is installed on this Exchange 2013 server. The Client Access role proxies connectivity for all clients, such as Microsoft Office Outlook, Outlook Web App, mobile devices, POP, and SMTP and also accepts mail from and delivers mail to other mail hosts on the Internet. Client access servers can be organized into Client Access server arrays.
EDG
Shows whether the Edge Transport role is installed on this Exchange 2013 server. Edge Transport servers handle the following functions:
The Clients panel groups components that represent current client connections to this Exchange 2013 server. This information includes:
OWA
Indicates the number of current Outlook Web Access (OWA) users logged on to this Exchange 2013 server. The Client Access role provides OWA to allow you to access your mailbox from a web browser and have full access to all the information in the mailbox including task lists, calendar information, mail items, public folders, UNC shares and SharePoint documents. This value is decremented when users log out of their OWA session, or the session times out.
Outlook
Shows the number of users currently connected to this Exchange 2013 server through RPC over HTTP. In Microsoft Exchange Server 2013, the Outlook Anywhere feature, formerly known as RPC over HTTP, lets clients that use Microsoft Office Outlook to connect to their Exchange servers from outside the corporate network or over the Internet using the RPC over HTTP Windows networking component.
ActiveSync
Shows the number of current secure HTTP connections (HTTPS) that are established from Windows Mobile-based or Exchange ActiveSync-enabled mobile devices to this Exchange 2013 server. ActiveSync is a push-orientated protocol. Data such as user messages, schedules, contact information, and tasks are synchronized over the HTTPS connection.
Web Service
Shows the current number of connections with the World Wide Web Publishing Service (W3SVC) for this Exchange 2013 server. This information can help you determine if your server can handle the current user load.
IMAP4
Shows the number of IMAP4 connections to this Exchange 2013 server. The Client Access role provides IMAP4 access to mailbox data for clients that rely on this protocol.
IMAP4 is an Internet messaging protocol that allows you to access mail on a server or download it to your computer. IMAP4 is designed for an environment where you can log on to the server from a variety of different workstations or across slow links.
The IMAP4 protocol is disabled by default on Exchange 2013 server. If this Exchange server needs to support IMAP4 clients, start the IMAP4 service. Otherwise, leave it disabled for security reasons.
POP3
Shows the number of POP3 connections to this Exchange 2013 server.
POP3 is an Internet messaging protocol that supports simple offline mail processing. POP3 allows you to download e-mail messages from the server and store them locally on a client computer.
By default, POP3 is not enabled. If POP3 is required, start the service. If this Exchange server does not need to support POP3 clients, leave it disabled for security reasons.
UM Clients
Shows the number of voice mail calls that are currently connected to the Unified Messaging Server since the service was started.
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