Exchange ActiveSync uses Direct Push to synchronize e-mail messages, calendar, contact, and task data with the mobile device. Exchange ActiveSync and Direct Push work by establishing two-way communication between the mobile device and the Exchange server, as shown in Figure 1. The device initiates a longstanding HTTPS request to the server. The server monitors the mailbox for the duration of the request. If new items arrive in the mailbox or synchronized folders within the duration of the request, the server notifies the device and requests that the device initiate synchronization. If there are no changes to the monitored folders within the duration of the HTTPS request, the request expires and a new request is generated by the device. This process keeps the device synchronized with the Microsoft Exchange mailbox.

Figure 1   Exchange ActiveSync Direct Push synchronization

When you use Exchange ActiveSync with Exchange 2007, you can use Direct Push functionality if you are using a device that is running Windows Mobile 5.0 with the Messaging & Security Feature Pack (MSFP) or a later version of Windows Mobile software. In addition, several third-party devices also support Direct Push. For more information about Direct Push, see the following topics:

• Understanding Direct Push
  
  
• Exchange ActiveSync Devices and Compatible Features
  
  

When you synchronize your mobile device with Exchange 2007, you will be able to do the following:

• Synchronize e-mail messages, calendar items, contacts, and tasks between your Exchange 2007 mailbox and your mobile device.
  
  

  Note:
  You cannot use Exchange ActiveSync to synchronize Microsoft Office Outlook notes from the Exchange server to a mobile device. E-mail messages, contacts, tasks, and calendar items are all synchronized.

• Manage and configure Microsoft Exchange settings such as Out of Office functionality. You can change your Out of Office status and configure an Out of Office auto-reply.
  
  
• Read e-mail messages sent with restricted permissions by using rights management.
  
  
• Search for names in the global address list (GAL).
  
  
• View e-mail messages with full HTML formatting, including images.
  
  
• Perform a remote device wipe on a lost or stolen device from Outlook Web Access.
  
  
• Recover a forgotten device password.
  
  

  Note:
  An Exchange ActiveSync mailbox policy must be running on the device to be able to recover a device password. If you are not sure if you have an Exchange ActiveSync mailbox policy, contact the system administrator for your organization.

• Download and listen to voice mail messages by using Exchange 2007 Unified Messaging.
  
  

  Caution:
  When you use Pocket Internet Explorer to access Outlook Web Access Light, you may be able to listen to a voice message that is attached to an e-mail message. However, this is not a supported configuration, because Pocket Internet Explorer is not a supported platform for Outlook Web Access Light.

  Note:
  Many of the features listed earlier require the latest version of Windows Mobile software, which is currently in development.

For more information about these features, see the following topics:

• Overview of Exchange ActiveSync
  
  
• How to Recover a Device Password
  
  
• How to Perform a Remote Wipe on a Device
  
  

Troubleshooting Exchange ActiveSync

Exchange Server 2007 offers significant improvements in Exchange ActiveSync for information workers. However, there are several features that are no longer available in Exchange 2007. Those features include Outlook Mobile Access and the ability to read S/MIME encrypted e-mail messages.

Outlook Mobile Access

Accessing S/MIME Encrypted E-Mail Messages