diff --git a/source/upgrade-guide/kolab-16.rst b/source/upgrade-guide/kolab-16.rst
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+.. _upgrade-guide-centos-7:
+
+======================================
+Upgrade of Kolab 3.4 to 16 on CentOS 7
+======================================
+
+The installation of Kolab Groupware on CentOS installs
+a number of additional packages, from the :term:`EPEL` software
+repository.
+
+Installation Procedure
+======================
+
+1.  Install the :term:`EPEL` repository:
+
+    .. parsed-literal::
+
+        # :command:`rpm -Uhv https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm`
+
+2.  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`
+
+3.  Import the community GPG key used to sign the packages:
+
+    .. parsed-literal::
+
+        # :command:`rpm --import https://ssl.kolabsys.com/community.asc`
+
+4.  Install the **yum-plugin-priorities** package:
+
+    .. parsed-literal::
+
+        # :command:`yum install yum-plugin-priorities`
+
+5.  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`
+
+
+6.  Replace php-mysql with php-mysqlnd: 
+
+    .. parsed-literal::
+
+        # :command:`yum shell`
+                   `> remove php-mysql`
+                   `> install php-mysqlnd`
+                   `> run`
+                   `(Confirm as requested)`
+                   `> exit`
+
+
+7.  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`
+
+Continue to :ref:`install-kolab`.
+
+