To get started with Exchange ActiveSync development:

  1. Read an intro to the Exchange ActiveSync protocol
    http://mobilitydojo.net/2010/03/17/digging-into-the-exchange-activesync-protocol/
  2. Try out the EAS MD diagnostic utility for Exchange ActiveSync
    http://mobilitydojo.net/downloads
  3. Read about implementing your own Exchange ActiveSync client
    http://mobilitydojo.net/2011/08/10/exchange-activesync-building-blocks-intro/
  4. Pull down the source for this API, and get coding!
    https://easweb.codeplex.com/SourceControl/latest