The following error can be found in the log file:
14:48:50| Info| Error connecting to URL: {0} Exception: {1}|
https://contoso.contoso.com/XRMServices/2011/Organization.svc, System.ServiceModel.FaultException: The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework SDK documentation and inspect the server trace logs.
at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
at System.Windows.Forms.Control.Invoke(Delegate method)
at Microsoft.Crm.Outlook.ClientAuth.ClientAuthProvider`1.RetrieveUserCredentialsAndSignIn(Control parentWindow, Boolean retryOnError, IClientOrganizationContext context)
at Microsoft.Crm.Outlook.ClientAuth.ClientAuthProvider`1.SignIn(AuthUIMode uiMode, IClientOrganizationContext context, Control parentWindow, Boolean retryOnError)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.DeploymentInfo`1.LoadOrganizationsInternal(AuthUIMode uiMode, Control parentWindow)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.DeploymentInfo`1.LoadOrganizations(AuthUIMode uiMode, Control parentWindow, IClientAuthProvider`1 authenticatedProvider)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.InternalLoadOrganizations(DataCollection`1 orgs, AuthUIMode uiMode, Control parentWindow)