Hello my site is www.debya.com I was opened it on 2002 and it is asp. now I am renewing it, I am writing with asp.net and the new site is using "URL Rewriting" method. Now I am afraid of losing my search engine position. what is my risk ? what is the seo friendly site update method...
Perhaps you could create a sitemap with the old links while developing the new site. Or, keep the original site and use another site or a subdomain to work on the new version. I'm not a guru but i guess some search engine position will be lost..