diff --git a/src/java/davmail/exchange/ExchangeSession.java b/src/java/davmail/exchange/ExchangeSession.java
index 6ab1b56d..23c2c7dc 100644
--- a/src/java/davmail/exchange/ExchangeSession.java
+++ b/src/java/davmail/exchange/ExchangeSession.java
@@ -422,7 +422,8 @@ public abstract class ExchangeSession {
 
         HttpMethod logonMethod = buildLogonMethod(httpClient, initmethod);
         if (logonMethod == null) {
-            throw new DavMailException("EXCEPTION_AUTHENTICATION_FORM_NOT_FOUND", initmethod.getURI());
+            LOGGER.debug("Authentication form not found at " + initmethod.getURI()+ ", trying default url");
+            logonMethod = new PostMethod("/owa/auth/owaauth.dll");
         }
 
         // make sure username and password fields are empty
@@ -1079,6 +1080,7 @@ public abstract class ExchangeSession {
 
     /**
      * Send Mime message.
+     *
      * @param mimeMessage MIME message
      * @throws IOException on error
      */
@@ -1452,6 +1454,7 @@ public abstract class ExchangeSession {
         /**
          * Get permanent message id.
          * permanentUrl over WebDav or IitemId over EWS
+         *
          * @return permanent id
          */
         public abstract String getPermanentId();
diff --git a/src/java/davmailmessages.properties b/src/java/davmailmessages.properties
index f24c93d9..4826cc36 100644
--- a/src/java/davmailmessages.properties
+++ b/src/java/davmailmessages.properties
@@ -1,7 +1,6 @@
 EXCEPTION_AUTHENTICATION_FAILED=Authentication failed: invalid user or password
 EXCEPTION_AUTHENTICATION_FAILED_PASSWORD_EXPIRED=Authentication failed: password expired ?
 EXCEPTION_AUTHENTICATION_FAILED_RETRY=Authentication failed: invalid user or password, retry with domain\\user
-EXCEPTION_AUTHENTICATION_FORM_NOT_FOUND=Authentication form not found at {0}
 EXCEPTION_CONNECTION_FAILED=Unable to connect to OWA at {0}, status code {1}, check configuration
 EXCEPTION_DAVMAIL_CONFIGURATION=DavMail configuration exception:\n{0}
 EXCEPTION_END_OF_STREAM=End of stream reached reading content
diff --git a/src/java/davmailmessages_fr.properties b/src/java/davmailmessages_fr.properties
index a7f183f3..71ef0f28 100644
--- a/src/java/davmailmessages_fr.properties
+++ b/src/java/davmailmessages_fr.properties
@@ -1,7 +1,6 @@
 EXCEPTION_AUTHENTICATION_FAILED=Echec d''authentification : identifiant ou mot de passe invalide
 EXCEPTION_AUTHENTICATION_FAILED_PASSWORD_EXPIRED=Echec d''authentification : mot de passe expiré ?
 EXCEPTION_AUTHENTICATION_FAILED_RETRY=Echec d''authentification : identifiant ou mot de passe invalide, réessayer avec domaine\\utilisateur
-EXCEPTION_AUTHENTICATION_FORM_NOT_FOUND=Formulaire d''authentification non trouvé à l''adresse {0}
 EXCEPTION_CONNECTION_FAILED=Connection OWA à {0} impossible, code retour {1}, vérifier la configuration
 EXCEPTION_DAVMAIL_CONFIGURATION=Erreur de configuration DavMail :\n{0}
 EXCEPTION_END_OF_STREAM=Fin de flux âtteint pendant la lecture du contenu