+This default set can be extended by adding following values:
+``1`` - all subscribed folders in personal namespace
+``2`` - all folders in personal namespace
+``4`` - all subscribed folders in other users namespace
+``8`` - all folders in other users namespace
+``16`` - all subscribed folders in shared namespace
+``32`` - all folders in shared namespace
+
+``activesync_multifolder_blacklist``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defines a blacklist of devices (device type strings) that do not support folder hierarchies.
+When set to an array folder hierarchies are used on all devices not listed here.
+When set to ``null`` an old whitelist approach will be used where we do opposite
+action and enable folder hierarchies only on device types known to support it.
+
+Note: To enable multi-folder for all devices set it to ``array()``.
+
+``activesync_multifolder_blacklist_*``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Blacklist overwrites for specified object type. If set to an array
+it will have a precedence over ``activesync_multifolder_blacklist`` list only for that type.
+Note: Outlook does not support multiple folders for contacts, in that case use ``$config['activesync_multifolder_blacklist_contact'] = array('windowsoutlook');``.