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This was what I was looking for! The pages are indexed by Google, yes, but they aren't being crawled by the Googlebot (as my Webmaster Tool and the Matt Cutts Video is telling me), but they are occasionally being crawled by the Rogerbot probably (not monthly). Thank you very much!

Yes yes, canonicalization or meta noindex-tag would be better of course to pass the possible link juice, but we aren't worried about that. I was worried Google would still see the pages as duplicates. (couldn't really distile that out of the article, although it was useful!) Barry Smith answered that last issue in the answer below, but i do want to thank you for your insight.

Thanks mister Goyal. Of course we have been thinking about ways and figured out some options in doing so, but implementing these solutions would be disastreous from a time/financial perspective. The pages that we have blocked from the spiders aren't needed for visibility in the search engines and don't carry much link juice, they are only there for the visitors, so we decided we don't really need them for our SEO-efforts in a positive way. But when these pages do get crawled and the engines notice the huge amount of duplicates, i recogn this would have a negative influence on our site as a whole.

So, the problem we have is focused on the doubts we have on the legitimacy of the report. If SEOMoz can crawl it, the Googlebot could probably too, right, since we've used: User-agent: *

Hi there,

In order to reduce the huge amount of duplicate content and titles for a cliënt, we have disallowed all  spiders for some areas of the site in August via the robots.txt-file. This was followed by a huge decrease in errors in our SEOmoz crawl report, which, of course, made us satisfied.

In the meanwhile, we haven't changed anything in the back-end, robots.txt-file, FTP, website or anything. But our crawl report came in this November and all of a sudden all the errors where back. We've checked the errors and noticed URLs that are definitly disallowed. The disallowment of these URLs is also verified by our Google Webmaster Tools, other robots.txt-checkers and when we search for a disallowed URL in Google, it says that it's blocked for spiders. Where did these errors came from? Was it the SEOmoz spider that broke our disallowment or something? You can see the drop and the increase in errors in the attached image.

Thanks in advance.

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