Hello,
I am a newbe in SF platform. I have an E-mail campaign app like mailchimp developed in .NET Technologies. Where user can import contacts form popular web services Like Dropbox, FresBook, Highrise,Googleapps, Hotmail etc. Now i need to intigrate Salesforce so that my user can import his/her contacts from SF account. Can anyone point me in the right direction? Is it possible to access any SF organization through webservice? If yes then which a Authentication Service i will use? Thanks in advance.