Thanks for your quick answer!

But I have one problem, I don't get the messages to download.

Let me explain what I have done so far:

Action: 
Download web site(s)

Web Addresses:
<http://forum.blpublishing.com/forum_topics.asp?FID=10>
<http://forum.blpublishing.com/forum_topics.asp?FID=11>
<http://forum.blpublishing.com/forum_topics.asp?FID=12>
<http://forum.blpublishing.com/forum_topics.asp?FID=13>

Scan Rules (filter):
+*.png +*.gif +*.jpg +*.css +*.js -ad.doubleclick.net/*
-mime:application/foobar
 -* +*FID=10* +*FID=11* +*FID=12* +*FID=13*

This alows me to download the topics and all pages in them as well, but I
don't get the messages in the topics.

I hope you understand what I mean.