Hello Gizmo,
after setting all the paths, the import initiated succesfully but generated an error halfway:

Importing forum: "Professioneel Forum"
Importing forum: "Route Forum"
Importing forum: "Advertorials"
Importing forum: "KLM Forum"
Importing forum: "Air exel Forum"

Warning: html::include(languages//generic.php) [function.html-include]: failed to open stream: No such file or directory in C:\Inetpub\vhosts\vnvdalpa.nl\httpdocs\vnv_web\forums\libs\ubbthreads.inc.php on line 799

Warning: html::include() [function.include]: Failed opening 'languages//generic.php' for inclusion (include_path='.;./includes;./pear') in C:\Inetpub\vhosts\vnvdalpa.nl\httpdocs\vnv_web\forums\libs\ubbthreads.inc.php on line 799

Notice: Smarty error: unable to read resource: "not_right_bare.tpl" in C:\Inetpub\vhosts\vnvdalpa.nl\httpdocs\vnv_web\forums\libs\smarty\Smarty.class.php on line 1088

Not all the Forums were imported, and does imported contained no postings. It looks like the members are imported properly.

Should I do a new import? And how do I do it?
Thanx