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Hi BWRic, Sorry for getting back to you so late, the problem seemed to be resolved but the website is having troubles again, anyway, thanks a lot for your help and advice. Best regards, Daniel.

When you say "park on top of" what do you mean, exactly? Typically, the host would be redirecting somehow (or using a CNAME). For the old, active domains, you should keep the 301-redirects in place for the foreseeable future (at least a year) - the benefits far outweigh the costs. After that, you can probably just keep the domains and redirect them from the registrar directly (in other words, you won't need them hosted and redirected page-by-page). With the several other domains, do those have active sites with content or are they just registered domains? There's no harm in pointing those domains to your main site, but it doesn't really accomplish much if they never were set up. If they're active sites, it really does depend on the scope and focus. I wouldn't 301-redirect dozens of domains all at once, as that can look suspicious. Personally, I'm not nearly as fond of microsites as I once was. The benefits are declining, and the costs are increasing. The biggest cost, practically, is just splitting your efforts. At one time, that basically just meant content. Now, it means splitting link profiles, social efforts, etc. It's rarely worth the time and money. There are exceptions, and well-targeted microsites can work. Creating them just to have a few long-tail domains, though, isn't usually worth the trouble, and can create duplication issues.