Finally ! after almost a year since the last update from 5 to 6.
Difficulties were the conversion of the old image nodes to the new nodes + image field flavour. Not everything works yet, enough for me to do !
Time flies ! I just noticed that this site is already running on Drupal for 10 years. My user-id on drupal.org is 4945 ... I'm not so active anymore on the Drupal site, but I guess I'm one of the oldie goldies.
I had to delete a lot of content: all the weblinks (most of them pointed to nowhere anyway), photo's of old friends and some other stuff.
See here for the photos of our last holiday ! Nothing spectacular, but we had a good time, although it was only a mid-week. The park (Landal, Rabbit Hill) is very child friendly and we had a good time.
Better late than never. The upgrade went smooth. A few modules are not upgraded (filestore2 and fscache) but that's not too big a problem. I just need to convert the nodes generated by this module to generic nodes with attachments.