EWS code return Error : Request failed. The remote server returned an error: (403) Forbidden OR (401) Unauthorized

Following is my code.

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

service.TraceEnabled = true;

service.Credentials = new WebCredentials("xx@xx.com", "xxxx123");

service.Url = new Uri("https://mail.xxxxxx.com/EWS/Exchange.asmx");

FolderView v = new FolderView(5);

ServicePointManager.ServerCertificateValidationCallback = RemoteCertificateValidationCallback;

service.FindFolders(WellKnownFolderName.Inbox, v);

//Error on above line.

I tried changing the code line as below and I get another Error ....

service.Credentials = new NetworkCredential("xx@xx.com", "xx","xxxxxxxx");

"The remote server returned an error: (401) Unauthorized."

How do i resolve. and what is difference between NetworkCredential and WebCredentials ?

This is Resolved.

I figure out that the problem was in code line

service.Credentials = new NetworkCredential("xx@xx.com", "xx","xxxxxxxx");

Instead of xx@xx.com it should be just username 'xx'. That Solved.

Phew!!

Regards