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[azguy]

Is it bad to have html pages on a blog?

I converted a completely HTML site to wordpress, but havd hundreds of article pages that are still html.

[JoeAmadon]

There is absolutely nothing wrong with that, as long as I'm understanding your situation. There is not a big difference to search engines whether you pages are HTML or XHTML. Running them through a validator is a good idea though.

http://validator.w3.org/

[mosaicpro]

It has no SEO effect if you keep your naming identical and in wordpress add .html  so keeping the same url structure and naming. The extension is not taken in consideration. However if you move from  /page.html to  /page (no extension) it will be considered as a new page. So what you have to do is a 301 redirect from .html to /page...  manually first and then if you have all your pages without extension just create a htaccess to redirect all pages from .html to no extension.

Hope it helps. Let me know if you have any questions.