The header is superfluous and not used in other upgrade guides either.

If the header persists, please ensure that it is globally unique, like "upgrade-guide-kolab-3.4-to-16"

Other guides use:

Upgrade Notes from Kolab 3.4 to 3.5

implying that the "CentOS 7" part is a given.

This should have already happened as a prerequisite for the installation of Kolab 3.4.

I'm missing the step where the Kolab:3.4 and Kolab:3.4:Updates repositories are removed.

This should have already happened as a prerequisite for the installation of Kolab 3.4.

This should have already happened as a prerequisite for the installation of Kolab 3.4.

This may need to become:

.. parsed-literal::

    # :command:`yum shell`
    > :command:`remove php-mysql`
    > :command:`install php-mysqlnd`
    > :command:`run`
    (Confirm as requested)
    > :command:`exit`

It seems this is a wrong reference.

Please use a capital 'C'.

Please use "After upgrading the packages", correct typo.

These last two steps for Guam and Manticore can be moved to be the first two steps, since they are free of charge and have no impact.

That way, in sort of like an intermezzo new paragraph, you can re-iterate that if people are still using all defaults, they can execute the setup-kolab roundcube command (which requires the correct password for the current roundcube database user), and the setup-kolab imap command.

If not running with defaults, copy off the original (current) configuration so they can compare later and re-apply their changes to the newly generated configuration files.