diff --git a/source/administrator-guide/index.rst b/source/administrator-guide/index.rst
--- a/source/administrator-guide/index.rst
+++ b/source/administrator-guide/index.rst
@@ -38,6 +38,7 @@
 
     imap-access-rights-reference
     kolab-freebusy-reference
+    kolab-activesync-reference
     roundcube-settings-reference
 
     ../glossary
diff --git a/source/administrator-guide/kolab-activesync-reference.rst b/source/administrator-guide/kolab-activesync-reference.rst
new file mode 100644
--- /dev/null
+++ b/source/administrator-guide/kolab-activesync-reference.rst
@@ -0,0 +1,145 @@
+.. _admin_kolab-activesync-settings:
+
+===========================================
+Kolab ActiveSync Service Settings Reference
+===========================================
+
+The web service is based on Roundcube Framework and because of that it uses
+the same configuration file as the webmail application i.e. ``/etc/roundcubemail/config.inc.php``.
+
+Basic Configuration
+===================
+
+``activesync_debug``
+^^^^^^^^^^^^^^^^^^^^
+
+Enables ActiveSync protocol debuging. This will store the complete communication between
+server and activesync client into ``logs/console`` file. Default is ``false``.
+
+``activesync_user_log``
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Enables logging to a separate directory for every user/device. Default is ``false``.
+
+``activesync_user_debug``
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Enables per-user debugging only if /var/log/kolab-syncroton/<username>/ folder exists.
+Default is ``false``.
+
+``activesync_log_file``
+^^^^^^^^^^^^^^^^^^^^^^^
+
+If specified all ActiveSync-related logs will be saved to this file. Default is ``null``.
+Note: This doesn't change Roundcube Framework log locations.
+
+``activesync_addressbooks``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A list of global addressbooks (GAL). Default is ``array()``.
+Note: If empty ``autocomplete_addressbooks`` setting will be used.
+
+``activesync_gal_fieldmap``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+ActiveSync to Roundcube contact fields map for GAL search.
+Default:
+
+.. code-block:: php
+
+   array(
+       'alias'         => 'nickname',
+       'company'       => 'organization',
+       'displayName'   => 'name',
+       'emailAddress'  => 'email',
+       'firstName'     => 'firstname',
+       'lastName'      => 'surname',
+       'mobilePhone'   => 'phone.mobile',
+       'office'        => 'office',
+       'picture'       => 'photo',
+       'phone'         => 'phone',
+       'title'         => 'jobtitle',
+    );
+
+
+``activesync_plugins``
+^^^^^^^^^^^^^^^^^^^^^^
+
+List of Roundcube plugins available for ActiveSync service.
+WARNING: Not all plugins used in Roundcube can be listed here. Use the default!
+
+``activesync_init_subscriptions``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+When a device is reqistered (connects for the first time), by default a set of folders
+is subscribed for syncronization, i.e. INBOX and personal folders with defined folder type:
+mail.drafts, mail.wastebasket, mail.sentitems, mail.outbox, event, event.default,
+contact, contact.default, task, task.default.
+
+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_fix_from``
+^^^^^^^^^^^^^^^^^^^^^^^
+
+Enables adding sender name in the From: header of an email sent via ActiveSync
+when a device uses email address only (e.g. iOS devices). Default is ``false``.
+
+
+Performance Related Configuration
+=================================
+
+``activesync_cache'``
+^^^^^^^^^^^^^^^^^^^^^
+
+A type of ActiveSync cache. Supported values: ``'db'``, ``'apc'`` and ``'memcache'``.
+Default is ``'db'``.
+Note: This cache is only for some additional data like timezones mapping.
+
+``activesync_cache_ttl``
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+A lifetime of ActiveSync cache entries. Possible units: s, m, h, d, w. Default is ``'1d'``.
+
+``activesync_auth_cache``
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A type of ActiveSync authentication cache. Supported values: ``'db'``, ``'apc'`` and ``'memcache'``.
+Default is ``'db'``.
+Note: This is only for username canonification.
+
+``activesync_auth_cache_ttl``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+A lifetime of ActiveSync authentication cache. Possible units: s, m, h, d, w. Default is ``'1d'``.
+
+``activesync_ping_timeout``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defines for how many seconds we'll sleep between every action for detecting changes in folders.
+Default is ``60``.
+
+``activesync_ping_interval``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Defines maximum Ping interval in seconds. Default is ``900`` (15 minutes).
+
+``activesync_quiet_time``
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+We start detecting changes n seconds since the last sync of a folder. Default is ``180``.