I want to redirect my site from .html to .aspx extension without affecting page rank? Your suggestion plz?

You want to use 301 redirects. On a Linux (Apache) server, you would do this with an .htaccess file. I'm not sure how you would do this with IIS (Sorry, I don't work with Windows servers). Alternatively, you can do this on a page-by-page level.

Either way, you're going to want to do 301 Permanent Redirects. A small amount of page rank WILL be lost, but the majority won't. Google has acknowledged that it works like this to deter people from redirecting one page to another page to another page to another page, by having it lose a smalllll amount of pagerank with each redirect.

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