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Thanks everybody for your answers..I think I will consider adding a blog section installing WordPress into a subdirectory, as Dan Shure suggested. Is there any other way to do this in the most easy way? As written in my question, I cannot lose any page or have any other seo consequence by adding a blog section in my website.

Thanks again and have a nice day.

Thanks for your thorough answer Dan! I think I will try this solution. But before doing this I would be pretty sure about the consequences of adding a section with a wp blog in my website. In the past I thought of rebuilding the whole site in wp but it seemed a very long and hard work to do. So I think the solution you suggest could solve my issue. This solution won't affect any other part of my website, right?

Good evening everybody. I am new on SeoMoz that I find very helpful in my work.

I am not a web developer so please excuse me if my technical language is poor.I have an issue that maybe you can help me to solve. I work for a company who has a website, which is old and very well positioned on google for the most important keywords for the field of the company I work for (dentistry). It is a website made some years ago and it's made of static html pages.I would like to add a section in my website where I can post articles, like a blog (I think of a wordpress-style website) with daily posts (so with a dynamic page).  Is there a way to do this without modifying the structure of the website and without losing pages, urls and ranking? We're on the first google page for many keywords of interests in our city and it would be a great damage for us to lose those positions.Thank you very much!