Out of the box, Tableau supports plotting zip/postal codes for the US, Canada, UK, France, Germany, Australia and NZ but you're right not Holland.
To get your zip codes plotted you will need the lat/long coordinates of those zips and either add them to your datasource or add them to Tableau as custom geocoding.
To get the lat/longs you can either buy a database like the one here http://www.geopostcodes.com/index.php?pg=browse&grp=1&sort=3&niv=3&id=11&l=0 (I know you said free, but 99 euros doesn't seem to dear) or you can use a lat/long lookup tool such as the one here http://stevemorse.org/jcal/latlonbatch.html
Once you get that you can add the lat longs to your rows in your data source and then plot these on the rows and columns in Tableau, or you can create a csv file and import it using the instructions here http://onlinehelp.tableausoftware.com/v7.0/pro/online/en-us/custom_geocoding.html
Hope that helps!
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To add to Robin's suggestions - if postcodes not available, another batch geocoder: http://www.findlatitudeandlongitude.com/batch-geocode/#.UXqQksrsWHs - which has the advantage of providing error codes plus an indication of the resolution/accuracy, useful when working with large data-sets & needing to validate.
Thanks for the info. I found out that importing zipgeo-codes is only possible with the professional edition of tableau and not with tableau public and since the trial has expired i can't test it but i will as soon as i can. thanks !
Hi James, Thanks i will look at it asap.