diff --git a/source/about/guam/building.rst b/source/about/guam/building.rst
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+========
+Building
+========
+
+Build Requirements
+==================
+
+The following requirements need to be fulfilled to build Guam:
+
+.. include:: rpm-buildrequires.txt
+
+Build Instructions
+==================
+
+.. parsed-literal::
+
+    $ :command:`rebar compile -v`
+    $ :command:`rebar eunit -v`
+    $ :command:`cd rel/`
+    $ :command:`rebar generate -v`
diff --git a/source/about/guam/configuration.rst b/source/about/guam/configuration.rst
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+=============
+Configuration
+=============
+
+The **Guam** configuration lives in
+:file:`rel/kolab_guam/releases/*/sys.config` when running from source
+directly, and in :file:`/etc/guam/sys.config` for installation from packages.
+
+The configuration file consists of sections for each of the applications to
+configure, where it needs to be understood that **kolab_guam** is one such
+application, and **lager** for logging, and **sasl** for authentication, are
+two of the other sections.
+
+This documentation only involves the **kolab_guam** section, and we refer you
+to the documentation upstream for the others.
+
+Since **Guam** is a reverse IMAP proxy, it needs to be configured against an
+IMAP server (the backend "imap_servers"), and it needs to be configured to
+receive client connections (the "listeners").
+
+IMAP (backend) Server Configuration
+===================================
+
+The default configuration for **imap_servers** looks as follows:
+
+.. code-block:: erlang
+    :linenos:
+
+            {
+                imap_servers, [
+                    {
+                        imap, [
+                            { host, "127.0.0.1" },
+                            { port, 143 },
+                            { tls, starttls }
+                        ]
+                    },
+                    {   
+                        imaps, [
+                            { host, "127.0.0.1" },
+                            { port, 993 },
+                            { tls, true }
+                        ]
+                    }
+                ]
+            },
+
+On line *4* and line *11* each start the configuration for a new backend
+server, named *imap* and *imaps* respectively.
+
+.. NOTE::
+
+    Strictly speaking, only one backend is required. The default configuration
+    only uses two to show how multiple backends could be configured. One
+    could configure completely different backends (say, 'kolabnow.com' and
+    'myhome.dyndns.org' for example).
+
+The *imap* backend connects to host `127.0.0.1` on port `143` and is
+configured to use `STARTTLS`.
+
+The *imaps* backend however connects to host `127.0.0.1` on port `993` and is
+configured to use implicit SSL/TLS.
+
+Listener Configuration
+======================
+
+The following **listeners** are configured by default:
+
+.. code-block:: erlang
+       :linenos:
+
+            {
+                listeners, [
+                    {
+                        imap, [
+                            { port, 9143 },
+                            { imap_server, imap },
+                            {
+                                rules, [
+                                    { filter_groupware, [] }
+                                ]
+                            },
+                            {
+                                tls_config, [
+                                    { certfile, "/etc/pki/tls/private/localhost.pem" }
+                                ]
+                            }
+                        ]
+                    },
+                    {
+                        imaps, [
+                            { port, 9993 },
+                            { implicit_tls, true },
+                            { imap_server, imaps },
+                            {
+                                rules, [
+                                    { filter_groupware, [] }
+                                ]
+                            },
+                            {
+                                tls_config, [
+                                    { certfile, "/etc/pki/tls/private/localhost.pem" }
+                                ]
+                            }
+                        ]
+                    }
+                ]
+            }
+
+Again, each listener is provided with an identity (*imap* and *imaps*
+respectively), listens on a different port (*9143* and *9993* respectively),
+with subtly different configuration;
+
+*   The *imap* listener on port *9143* is supposed to be used by clients that
+    are configured to use `STARTTLS`,
+
+*   The *imaps* listener on port *9993* is supposed to be used by clients that
+    are configured to use implicit SSL/TLS (hence the `{ implicit_tls, true }`
+    on line *22*.
+
+The **imap_server** configuration for each of the listeners contains the name
+of the backend IMAP server configuration to use.
+
+.. NOTE::
+
+    Note that a plaintext, STARTTLS and implicit SSL/TLS **listener** can,
+    each of them separately, use a plaintext, STARTTLS and/or implicit SSL/TLS
+    backend IMAP server (configured in the **imap_servers** section).
+
+Configuration in a Kolab Groupware Setup
+========================================
+
+In a Kolab Groupware setup, **Guam** is configured with **listeners** on ports
+`143` and `993`, against an **imaps** IMAP server on `localhost` port `9993`.
diff --git a/source/about/guam/index.rst b/source/about/guam/index.rst
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+.. _about-guam:
+
+====
+Guam
+====
+
+**Guam** is an intelligent reverse IMAP proxy that applies rulesets to
+commands, command results and payload, provided context.
+
+Current features include filtering groupware folders from IMAP folder
+operations, such that IMAP clients who do not understand Kolab Groupware
+folders are not shown those folders.
+
+Future features include Data-Loss Prevention (DLP) capabilities and Audit
+Trail integration.
+
+**Guam** is a Kolab product hosted at `Phabricator`_:
+
+*   Project URL: https://git.kolab.org/tag/guam/
+
+*   Git URL (anonymous): https://git.kolab.org/diffusion/G/guam.git
+
+*   Git URL (authorized): ssh://git@git.kolab.org/diffusion/G/guam.git
+
+.. rubric:: Further Information
+
+.. toctree::
+    :maxdepth: 1
+    :glob:
+
+    *