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Umesh JhadeUmesh Jhade 

Sales Force Two way Contacts Synchronization to my custom web application's address book

Hello Sir
 I have my own custom web application that  manager marketing & prmotion activity , lead and Contact Address book of my customers.  Now I want integrate salesforce in my webapplication so my customer can Synchronize their Contact Address book to their salesforce contacts.  It need to be bidirectional synchronization. I am new on salesforce, can you let me know starting steps to achieve this task ? IS this also required to develop a salesforce app ?  I searched in many forum and documentation but didn't find any way so i can start implementaion this task.

Kindly help me
thanks