Exchange Server 2010 Learning (16) Client Access Methods

In a state-owned enterprise mail Administrator training, many friends put forward in Outlook some features can not be achieved, such as contact sync, calendar synchronization. This situation may be caused by the way Exchange Client access is encountered. In Exchange Server2010, the Client Access server role supports Outlook Web App, Microsoft Exchange ActiveSync, Post Office Protocol version 3 (POP3), and Internet Mail Access Protocol version 4r EV1 (IMAP4), MAPI, and so on. Now, let's talk about these kinds of visits separately.

Outlook Web App

Known as Outlook Web Access in earlier versions of Exchange, it was redesigned in Exchange 2010. Improvements in appearance, functionality, and availability. For example, in Exchange 2010, you can use the Outlook Web App mailbox policy to control the user's access to features in Outlook Web App, and to use the Outlook Web App and Exchange Control Panel for almost any web Browser. Includes Internet Explorer on computers running UNIX, Apple Macintosh, or Windows, Mozilla Firefox, Apple Safari, Chrome, and most other Web browsers; Session view enables users to View all messages in the thread, including messages that are not in the current folder; Users can access a predefined set of filters to quickly search the contents of a folder, and more action is added to the right-click menu in the Outlook Web App; A user can attach a message to a new message in the mailbox. In previous versions of Outlook Web apps, users could attach files to a message, but they could not attach a message to a message.

Exchange ActiveSync

Exchange ActiveSync is a Microsoft Exchange synchronization protocol optimized for high latency and low-bandwidth networks. HTTP and XML based protocols enable mobile phones to access organizational information on servers that are running Microsoft Exchange. Exchange ActiveSync enables mobile users to access their e-mail messages, calendars, contacts, and tasks, and continues to access the information while working offline.

By default, Exchange ActiveSync is enabled. All users who have an Exchange mailbox can synchronize their mobile phones with a Microsoft Exchange server. You can perform policies such as enabling and disabling users ' Exchange ActiveSync, setting policy such as minimum password length, device lockout, and maximum password attempt failures, initiating remote erasure, purging all data from lost or stolen mobile phones, and running multiple reports to view or export to a reporting solution.

POP3 and IMAP4

By default, POP3 and IMAP4 are disabled in Exchange Server 2010. To support clients that depend on these protocols, you must first start the POP3 and IMAP4 services on the Exchange 2010 Client Access server. You must also configure SMTP for POP3 and IMAP4 clients to send e-mail messages.

POP3 is a commonly used e-mail Internet protocol. By default, downloaded messages are deleted from the server when the POP3 e-mail application downloads the e-mail message to the client computer. If a copy of the user's e-mail message is not kept on the e-mail server, the user cannot access the same e-mail message from multiple computers. However, some POP3 e-mail applications can be configured to keep copies of messages on the server so that the same e-mail messages can be accessed from another computer. POP3 client applications can only be used to download messages from the e-mail server to a folder on the client computer (typically the Inbox). The POP3 protocol cannot synchronize multiple folders on the e-mail server with multiple folders on the client computer. POP3 does not support public folder access.

e-mail client applications that use IMAP4 are more flexible and often provide more functionality than e-mail client applications that use POP3. By default, when the IMAP4 e-mail application downloads e-mail to the client computer, a copy of the downloaded message remains on the e-mail server. It is because the user's e-mail copy remains on the e-mail server that the user can access the same e-mail message from multiple computers. With IMAP4 e-mail, users can access and create multiple e-mail folders on the e-mail server. The user can then access any messages on the server from computers located in multiple locations. For example, most IMAP4 applications can be configured to keep a copy of the user's sent items on the server so that they can view their sent items from any other computer. IMAP4 supports other features supported by most IMAP4 applications. For example, some IMAP4 applications contain a feature that allows users to view only the headers (senders and subjects) of e-mail messages on the server, and then download only the messages they want to read. IMAP4 also does not support public folder access.

POP3 and IMAP4 cannot be used to send messages from a client application to an e-mail server. E-mail applications that use POP3 and IMAP4 to send mail rely on the SMTP protocol to send mail. Connectors that are used to receive e-mail submissions from client applications using POP3 or IMAP4 are automatically created on each Hub Transport server. So you'll see a receive connector for the client+ server name, which is to accept SMTP connections from all non-MAPI clients, such as POP and IMAP.

POP3 and IMAP4 applications: Because Exchange 2010 supports POP3 and IMAP4, users can connect to Exchange 2010 using any client application that supports POP3 and IMAP4. These applications include Outlook, Windows Mail, Microsoft Outlook Express, Entourage, and many third-party applications (such as Mozilla Thunderbird and Eudora). Each e-mail client application supports a different feature.

The following three common connection settings can be set on POP3 or IMAP4 client applications:

Send and receive messages each time the e-mail application is started. When you use this option, messages are sent and received only when you start the e-mail application.

Send and receive messages manually. When this option is used, messages are sent and received only when the user clicks the Send and receive option in the client user interface.

Send and receive messages regularly. When this option is used, the client application periodically connects to the server to send mail and download all new messages.