--- a/src/camel/camel-mapi-transport.c	
+++ a/src/camel/camel-mapi-transport.c	
@@ -39,20 +39,27 @@ 
 #include <ctype.h>
 #include <errno.h>
 
+#include <libemail-engine/libemail-engine.h>
+
+#include "camel-mapi-sasl-krb.h"
 #include "camel-mapi-settings.h"
 #include "camel-mapi-store.h"
-#include "camel-mapi-folder.h"
-#include "camel-mapi-store-summary.h"
-#define d(x)
 
-#include <e-mapi-defs.h>
+#include "e-mapi-defs.h"
 #include "e-mapi-mail-utils.h"
 #include "e-mapi-utils.h"
 
+#define d(x)
+
 #define STREAM_SIZE 4000
 
 G_DEFINE_TYPE (CamelMapiTransport, camel_mapi_transport, CAMEL_TYPE_TRANSPORT)
 
+struct _CamelMapiTransportPrivate
+{
+	EMapiConnection *conn;
+};
+
 static gboolean
 convert_message_to_object_cb (EMapiConnection *conn,
 			      TALLOC_CTX *mem_ctx,
@@ -80,6 +87,7 @@ mapi_send_to_sync (CamelTransport *transport,
                    GError **error)
 {
 	EMapiConnection *conn;
+	CamelMapiTransport *mapi_transport;
 	const gchar *namep;
 	const gchar *addressp;
 	mapi_id_t mid = 0;
@@ -89,8 +97,12 @@ mapi_send_to_sync (CamelTransport *transport,
 	gchar *profile;
 	GError *mapi_error = NULL;
 
+	mapi_transport = CAMEL_MAPI_TRANSPORT (transport);
+
+	g_return_val_if_fail (mapi_transport != NULL, FALSE);
+
 	if (!camel_internet_address_get (CAMEL_INTERNET_ADDRESS (from), 0, &namep, &addressp)) {
-		return (FALSE);
+		return FALSE;
 	}
 
 	g_return_val_if_fail (CAMEL_IS_SERVICE (transport), FALSE);
@@ -131,7 +143,11 @@ mapi_send_to_sync (CamelTransport *transport,
 		g_list_free_full (services, (GDestroyNotify) g_object_unref);
 	}
 
-	conn = e_mapi_connection_find (profile);
+	conn = mapi_transport->priv->conn;
+	if (conn)
+		g_object_ref (conn);
+	else
+		conn = e_mapi_connection_find (profile);
 
 	g_free (profile);
 
@@ -170,7 +186,8 @@ mapi_send_to_sync (CamelTransport *transport,
 }
 
 static gchar *
-mapi_transport_get_name(CamelService *service, gboolean brief)
+mapi_transport_get_name (CamelService *service,
+			 gboolean brief)
 {
 	CamelNetworkSettings *network_settings;
 	CamelSettings *settings;
@@ -201,21 +218,172 @@ mapi_transport_get_name(CamelService *service, gboolean brief)
 	return name;
 }
 
+static gboolean
+mapi_connect_sync (CamelService *service,
+                   GCancellable *cancellable,
+                   GError **error)
+{
+	CamelMapiTransport *mapi_transport = CAMEL_MAPI_TRANSPORT (service);
+	CamelServiceConnectionStatus status;
+	CamelSession *session;
+	CamelSettings *settings;
+	EMapiProfileData empd = { 0 };
+	gchar *name;
+
+	session = camel_service_ref_session (service);
+
+	if (!camel_session_get_online (session)) {
+		g_set_error_literal (
+			error, CAMEL_SERVICE_ERROR, CAMEL_SERVICE_ERROR_UNAVAILABLE,
+			_("Cannot connect MAPI store in offline mode"));
+		return FALSE;
+	}
+
+	status = camel_service_get_connection_status (service);
+	if (status == CAMEL_SERVICE_DISCONNECTED) {
+		return FALSE;
+	}
+
+	if (mapi_transport->priv->conn && e_mapi_connection_connected (mapi_transport->priv->conn)) {
+		return TRUE;
+	}
+
+	name = camel_service_get_name (service, TRUE);
+	camel_operation_push_message (cancellable, _("Connecting to '%s'"), name);
+
+	settings = camel_service_ref_settings (service);
+	e_mapi_util_profiledata_from_settings (&empd, CAMEL_MAPI_SETTINGS (settings));
+	g_object_unref (settings);
+
+	if (!camel_session_authenticate_sync (session, service, empd.krb_sso ? "MAPIKRB" : NULL, cancellable, error)) {
+		camel_operation_pop_message (cancellable);
+		g_free (name);
+		return FALSE;
+	}
+
+	camel_operation_pop_message (cancellable);
+	g_free (name);
+
+	return mapi_transport->priv->conn != NULL;
+}
+
+static gboolean
+mapi_disconnect_sync (CamelService *service,
+                      gboolean clean,
+                      GCancellable *cancellable,
+                      GError **error)
+{
+	CamelMapiTransport *mapi_transport = CAMEL_MAPI_TRANSPORT (service);
+
+	if (mapi_transport->priv->conn) {
+		e_mapi_utils_unref_in_thread (G_OBJECT (mapi_transport->priv->conn));
+		mapi_transport->priv->conn = NULL;
+	}
+
+	return TRUE;
+}
+
+static CamelAuthenticationResult
+mapi_authenticate_sync (CamelService *service,
+                        const gchar *mechanism,
+                        GCancellable *cancellable,
+                        GError **error)
+{
+	CamelAuthenticationResult result;
+	CamelMapiTransport *mapi_transport = CAMEL_MAPI_TRANSPORT (service);
+	CamelSession *session;
+	CamelSettings *settings;
+	CamelMapiSettings *mapi_settings;
+	CamelNetworkSettings *network_settings;
+	EMapiProfileData empd = { 0 };
+	const gchar *profile;
+	const gchar *password;
+	GError *mapi_error = NULL;
+	ENamedParameters *credentials;
+
+	settings = camel_service_ref_settings (service);
+	mapi_settings = CAMEL_MAPI_SETTINGS (settings);
+	network_settings = CAMEL_NETWORK_SETTINGS (settings);
+
+	empd.server = camel_network_settings_get_host (network_settings);
+	empd.username = camel_network_settings_get_user (network_settings);
+	e_mapi_util_profiledata_from_settings (&empd, mapi_settings);
+
+	profile = camel_mapi_settings_get_profile (mapi_settings);
+
+	if (empd.krb_sso) {
+		if (!e_mapi_util_trigger_krb_auth (&empd, error)) {
+			g_object_unref (settings);
+			return CAMEL_AUTHENTICATION_ERROR;
+		}
+
+		password = NULL;
+	} else {
+		password = camel_service_get_password (service);
+
+		if (password == NULL) {
+			g_set_error_literal (
+				error, CAMEL_SERVICE_ERROR,
+				CAMEL_SERVICE_ERROR_CANT_AUTHENTICATE,
+				_("Authentication password not available"));
+			g_object_unref (settings);
+			return CAMEL_AUTHENTICATION_ERROR;
+		}
+	}
+
+	credentials = e_named_parameters_new (); e_named_parameters_set (credentials, E_SOURCE_CREDENTIAL_PASSWORD, password);
+	session = camel_service_ref_session (service);
+	mapi_transport->priv->conn = e_mapi_connection_new (
+		e_mail_session_get_registry (E_MAIL_SESSION (session)),
+		profile, credentials, cancellable, &mapi_error);
+	e_named_parameters_free (credentials);
+	if (mapi_transport->priv->conn && e_mapi_connection_connected (mapi_transport->priv->conn)) {
+		result = CAMEL_AUTHENTICATION_ACCEPTED;
+	} else if (g_error_matches (mapi_error, E_MAPI_ERROR, MAPI_E_LOGON_FAILED) ||
+		   g_error_matches (mapi_error, E_MAPI_ERROR, ecRpcFailed)) {
+		g_clear_error (&mapi_error);
+		result = CAMEL_AUTHENTICATION_REJECTED;
+	} else {
+		/* mapi_error should be set */
+		g_return_val_if_fail (
+			mapi_error != NULL,
+			CAMEL_AUTHENTICATION_ERROR);
+		if (!e_mapi_utils_propagate_cancelled_error (mapi_error, error))
+			g_propagate_error (error, mapi_error);
+		else
+			g_clear_error (&mapi_error);
+		result = CAMEL_AUTHENTICATION_ERROR;
+	}
+
+	g_object_unref (settings);
+
+	return result;
+}
+
 static void
 camel_mapi_transport_class_init (CamelMapiTransportClass *class)
 {
 	CamelServiceClass *service_class;
 	CamelTransportClass *transport_class;
 
+	/* register MAPIKRB auth type */
+	CAMEL_TYPE_MAPI_SASL_KRB;
+
+	g_type_class_add_private (class, sizeof (CamelMapiTransportPrivate));
+
 	service_class = CAMEL_SERVICE_CLASS (class);
 	service_class->get_name = mapi_transport_get_name;
 	service_class->settings_type = CAMEL_TYPE_MAPI_SETTINGS;
+	service_class->connect_sync = mapi_connect_sync;
+	service_class->disconnect_sync = mapi_disconnect_sync;
+	service_class->authenticate_sync = mapi_authenticate_sync;
 
 	transport_class = CAMEL_TRANSPORT_CLASS (class);
 	transport_class->send_to_sync = mapi_send_to_sync;
 }
 
 static void
-camel_mapi_transport_init (CamelMapiTransport *transport)
+camel_mapi_transport_init (CamelMapiTransport *mapi_transport)
 {
+	mapi_transport->priv = G_TYPE_INSTANCE_GET_PRIVATE (mapi_transport, CAMEL_TYPE_MAPI_TRANSPORT, CamelMapiTransportPrivate);
 }
--- a/src/camel/camel-mapi-transport.h	
+++ a/src/camel/camel-mapi-transport.h	
@@ -50,11 +50,12 @@ 
 G_BEGIN_DECLS
 
 typedef struct _CamelMapiTransport CamelMapiTransport;
+typedef struct _CamelMapiTransportPrivate CamelMapiTransportPrivate;
 typedef struct _CamelMapiTransportClass CamelMapiTransportClass;
 
 struct _CamelMapiTransport {
 	CamelTransport parent;
-	gboolean connected;
+	CamelMapiTransportPrivate *priv;
 };
 
 struct _CamelMapiTransportClass {