Introduction to ActiveSync

ActiveSync is a protocol developed by Microsoft, primarily used for syncing emails, contacts, calendars, tasks, and notes from an Exchange server to a mobile device.
It ensures that any changes made on the server or the device are reflected in both places to maintain consistency and up-to-date information.

ActiveSync API Overview

Here, we will explore dozens of useful ActiveSync APIs and how to leverage them effectively. Examples include sending emails, syncing calendars, managing contacts, and more. Let’s dive into each of these with practical code snippets.

Send Email

  POST /Microsoft-Server-ActiveSync?Cmd=SendMail
  Headers:
    Content-Type: message/rfc822
    User-Agent: Apple-iPhone/705.18
    Host: mail.example.com
  
  Request Body:
  From: you@example.com
  To: user@example.com
  Subject: Test Email
  MIME-Version: 1.0
  Content-Type: text/plain; charset=UTF-8
  
  This is a test email message.

Sync Calendar

  POST /Microsoft-Server-ActiveSync?Cmd=Sync&DeviceId=12&DeviceType=SmartPhone
  Headers:
    Content-Type: application/vnd.ms-sync.wbxml

  Request Body:
  
    
      
        Calendar
        0
        calendar-collection-id
      
    
  

Manage Contacts

  POST /Microsoft-Server-ActiveSync?Cmd=Sync&DeviceId=24&DeviceType=SmartPhone
  Headers:
    Content-Type: application/vnd.ms-sync.wbxml
  
  Request Body:
  
    
      
        Contacts
        123456
        contacts-collection-id
      
    
  

Synchronize Inbox

  POST /Microsoft-Server-ActiveSync?Cmd=Sync&DeviceId=48&DeviceType=SmartPhone
  Headers:
    Content-Type: application/vnd.ms-sync.wbxml
  
  Request Body:
  
    
      
        Email
        7890
        inbox-collection-id
      
    
  

App Example: ActiveSync Mobile App

Let’s consider a simple app example utilizing the illustrated APIs. Our app will connect to the Exchange server, synchronize an inbox, and send an email.

  // Pseudocode
  initialize ActiveSyncConnection
  
  // Synchronize Inbox
  response = POST('/Microsoft-Server-ActiveSync?Cmd=Sync&DeviceId=48&DeviceType=SmartPhone', {
    headers: { 'Content-Type': 'application/vnd.ms-sync.wbxml' },
    body: `
            
              
                Email
                7890
                inbox-collection-id
              
            
          `
  })
  display response emails

  // Send an Email
  POST('/Microsoft-Server-ActiveSync?Cmd=SendMail', {
    headers: { 'Content-Type': 'message/rfc822',
               'User-Agent': 'App-Client/1.0',
               'Host': 'mail.example.com' },
    body: `From: user@example.com
           To: recipient@example.com
           Subject: Hello!
           MIME-Version: 1.0
           Content-Type: text/plain; charset=UTF-8
           
           Hi there, this is a test email from ActiveSync app.`
  })

The above example demonstrates a fundamental application of ActiveSync APIs. For a more comprehensive solution, integrate additional functionalities such as task management, calendar sync, and contact management.

For more details, refer to the official ActiveSync documentation.

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