How to import or sync Exchange data like Calendar, Contacts with a web application or web service.

1. Is there any API to import contacts and calendar (tasks and events) from exchange server to my calendar in web application using web services or http request. the user would have provided the username and password for his exchange account.

2. Is there any licensing involved to communicate with exchange server for its data.

thanks in advance 

• Edited by karthick.sk Wednesday, February 22, 2012 3:24 PM

You can get contacts/calendar items from exchange user mailboxes, then you can use Exchange Web Service (EWS) API or Exchange Web Services Managed API (from Exchange Server 2007 and above) to get the contents programmatically.

I am bit lost here; i have my exchange credentials, how (or) can i use the above mentioned solution for windows application or web services. can you please point in the right direction. my requirement is this: how to sync exchange data with a third party app or webapp(my development) using EWS. how to start with, starting point and steps to do[just overview ;)].

Could you please elaborate on this a little more or provide a starting point or code sample? I am having the same requirement as Karthick does, and would like to learn more.