+ModestTnyFolderRules modest_tny_folder_get_rules (TnyFolder *folder);
+
+/**
+ * modest_tny_folder_is_outbox_for_account:
+ * @folder: a valid tnymail folder
+ *
+ * Discover whether this folder is the per-account outbox for the specified
+ * account.
+ *
+ * Returns: TRUE if this folder is the per-account outbox for the account.
+ */
+gboolean modest_tny_folder_is_outbox_for_account (TnyFolder *folder,
+ TnyAccount *account);
+
+/**
+ * modest_tny_folder_get_account:
+ * @folder: a folder
+ *
+ * Get the parent account of the folder or, for TnyMergeFolder
+ * instances, get the local-folders account.
+ *
+ * Returns: the account. You should call g_object_unref() on this.
+ */
+TnyAccount *modest_tny_folder_get_account (TnyFolder *folder);
+
+/**
+ * modest_tny_msg_get_header_unique_id:
+ * @header: a #TnyHeader
+ *
+ * this function returns a unique id for a message summary, that's it
+ * a TnyHeader retrieved with tny_folder_get_headers (you can not use
+ * the TnyHeader returned by tny_msg_get_header because it has not an
+ * uid).
+ *
+ * This uid is built from the folder URL string and the header uid,
+ * the caller of the function must free the unique id when no longer
+ * needed
+ *
+ * Returns: a unique identificator for a header object
+ **/
+gchar* modest_tny_folder_get_header_unique_id (TnyHeader *header);