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I'm currently working on a website upgrade project, part of which has been to make the move from ASP Classic to the ASP.NET 2.0 Framework. Our current website is well indexed in Google and I'm worried about losing all of this because of the filename extension .NET files have (.aspx) compared to ASP Classic's .asp.
I've been very careful with file names and content is very similar (though with different HTML due to the design change) for example say we have the following page currently: http://www.example.com/aboutus.asp
The new URL for this page would be: http://www.example.com/aboutus.aspx
My plan was to upload all of the new pages and then use a Response.Redirect("aboutus.aspx") ASP Classic code to redirect the user from the old pages to the new, however after a bit of research on the subject of 301 and 302 redirects I've found a lot of horror stories of websites that have been completely dropped by Google due to this sort of action.
Have any of you had experience of this sort of language upgrade and the effects of the redirects on your Google indexing?
[edited by: Robert_Charlton at 5:48 pm (utc) on Feb. 8, 2008]
[edit reason] changed to example.com - it can never be owned [/edit]
Converting from .asp to .aspx what can I do to stay ranked? [webmasterworld.com]
If you are very precise technically, you can make the change with a minimal disruption - but make sure that your redirects are retruning a 301 status and not 302. Also take car not to introduce any duplicate urls that point ot the same content. I find it's best to deploy the new site in a test environment first to find all the bugs.
This was about a year ago. I believe the thread Tedster refers to mentions using isapi for your redirects.
We had no ranking drops to speak of - a temporary minor glitch with a relatively unimportant page - someone had stolen our content and the change brought this issue to the fore.
I think Tedster means to say that you should take care to not introduce different urls (not duplicate urls) that point to the same content.
As long as your are methodical and accurate with your isapi redirects and maintain the content/focus of your new pages you should not have many issues.
I guess "conventional wisdom" says that you should plan on a 3 to 6 month drop - we did plan for this and were ready with an adwords budget in case our organics tanked. Fortunately, they didn't.
Tedsters advise to test is sound.