diff --git a/source/upgrade-guide/index.rst b/source/upgrade-guide/index.rst
--- a/source/upgrade-guide/index.rst
+++ b/source/upgrade-guide/index.rst
@@ -8,6 +8,7 @@
 .. toctree::
     :maxdepth: 1
 
+    kolab-16
     kolab-enterprise-14
 
 .. toctree::
diff --git a/source/upgrade-guide/kolab-16.rst b/source/upgrade-guide/kolab-16.rst
new file mode 100644
--- /dev/null
+++ b/source/upgrade-guide/kolab-16.rst
@@ -0,0 +1,99 @@
+==================================
+Upgrade Notes from Kolab 3.4 to 16
+==================================
+
+The purpose of this document is, to describe the procedure of upgrading a Kolab Goupware installation from a default installed Kolab 3.4 (last "community verison") to Kolab 16.
+
+
+Upgrade Procedure
+=================
+
+#.  Install the Kolab Groupware repository configuration:
+
+    .. parsed-literal::
+
+        # :command:`cd /etc/yum.repos.d/`
+        # :command:`wget http://obs.kolabsys.com/repositories/Kolab:/16/CentOS_7/Kolab:16.repo`
+
+#.  Remove the existing Kolab 3.4 repositories:
+
+    .. parsed-literal::
+
+        # :command:`rm Kolab\\:3.4.repo`
+        # :command:`rm Kolab\\:3.4\\:Updates.repo`
+
+#.  Make sure that the packages from the Kolab repositories have a higher priority than eg. the :term:`EPEL` packages:
+
+    .. parsed-literal::
+
+        # :command:`for f in /etc/yum.repos.d/Kolab*.repo; do echo "priority = 60" >> $f; done`
+
+
+#.  Replace php-mysql with php-mysqlnd:
+
+    .. parsed-literal::
+
+        # :command:`yum shell`
+        > :command:`remove php-mysql`
+        > :command:`install php-mysqlnd`
+        > :command:`run`
+        (Confirm as requested)
+        > :command:`exit`
+
+#.  Update all:
+
+    .. parsed-literal::
+
+        # :command:`yum -y update`
+
+
+    .. NOTE:: During the cleanup, you might see the message:
+
+        .. parsed-literal::
+
+            `/var/tmp/rpm-tmp.TUmak9: line 1: fg: no job control`
+            `Cleanup    : cyrus-imapd-2.5-108.3.el7.kolab_3.4.x86_64                                               347/404`
+            `/var/tmp/rpm-tmp.K51Mal: line 2: fg: no job control`
+            `warning: %postun(cyrus-imapd-2.5-108.3.el7.kolab_3.4.x86_64) scriptlet failed, exit status 1`
+            `Non-fatal POSTUN scriptlet failure in rpm package cyrus-imapd-2.5-108.3.el7.kolab_3.4.x86_64`
+
+        This is a warning, and the Cyrus-imapd package will be updated. This can be checked after the update with the command:
+
+        .. parsed-literal::
+
+            # :command:`rpm -qv cyrus-imapd`
+
+
+
+Updating the configuration
+==========================
+
+After having upgraded the files in the Kolab installation via the packages from the Kolab 16 repository, the configuraiton needs to be updated. Use the command :term:`setup-kolab` for this operation.
+
+#.  Update the roundcube configuration:
+
+    .. parsed-literal::
+
+        # :command:`setup-kolab roundcube`
+
+    As setup-kolab is unable to write to the already existing mysql database, it will write the new and updated config file and restart the appropriate services.
+
+#.  Update the imap configuration:
+
+    .. parsed-literal::
+
+        # :command:`setup-kolab imap`
+
+#.  Configure the new module "Guam":
+
+
+    .. parsed-literal::
+
+        # :command:`setup-kolab guam`
+
+#.  Configure the new module "Manticore":
+
+    .. parsed-literal::
+
+        # :command:`setup-kolab manticore`
+