Hello Torsten, The blog post from Aaron does not work on Planet kolab: http://kolab.org/blog/aaron-seigo/2015/07/17/...-if-nothing-changes shows 403 forbidden The original post works fine at https://exote.ch/blogs/aseigo/2015/07/17/-if-nothing-changes/ Probably something with the dots in the title... All the best, Timotheus