ISAPI rewrite vs 301 redirect

seo urls asp aspx

[jcnh74]

Hello,
I'm in this crazy dilemma where our new application for our store is ready to go live but feel we might loose out on our old URLs rankings. We did a test with our secondary site by making all old urls to 301 redirect to the new ones. We definitely lost rankings on G with this approach.

The other approach would be to create a rewrite engine that would mask the new urls with the old as to keep our rankings. The tricky thing is we are already using a url rewrite with the new application.

Has anyone implemented a rewrite to save your old urls from diminishing from the tops of Google/Yahoo?

[Roxster]

I havent done this, however be careful for duplicate content.

[liushiping]

I think ISAPI rewrite is the best one to make urls rewrite.
You can browse "www.isapirewrite.com" to down a test of ISAPI rewrite.