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Thanks Dan. One thing I found interesting is that Google Webmaster Tools doesn't offer any alerts about pages that aren't indexed because of meta tags, only about those included in the robots.txt file.

Thanks for the clarification Ben. I think I'll leave older posts as is. They've been actively posting several times a week, so there should be enough fresh content. My hope is that Google recognizes the age of the blog because it's my understanding that age factors in the ranking algorithm.

Thanks, the site maps are a good idea. Ben, I'm not sure what you mean about making the content different to what Google has in its index. Because of the meta tag, it doesn't have any content in its index, right?

Just reviewed a WordPress blog that was launched in 2009 but somehow the privacy setting was to not index it, so all this time there's been a noindex, nofollow meta tag in the header. The client couldn't figure out why masses of content wasn't showing up in search results.

I've fixed the setting and assume Google will spider in short order; the blog is a subdirectory of their main site. My question is whether there is anything else I can or should do. Can Google recognize the age of the content, or that it once had a noindex meta tag? Will it "date" the blog as of today? Has the client lost out on untold benefits from the long history of content creation? I imagine that link juice from any backlinks to the blog will now flow back to the main site; think that's true?

Just curious what others might think of this scenario and whether any other action is warranted.