I have a customer's website that I replaced a specific HTML page (which was a form customers fill out) with an ASP.NET application to make it more robust.

My issue is that search engines still catalog the html page, so some visitors still hit it. I don't want to just take the old page down, because then they might think the site no longer exists if they hit that specific URL via a search engine, so I want to redirect to the ASP.NET app URL.

I know I can do a meta tag refresh to the new URL, but I also know that is generally the least desirable method of doing this. I read the proper way is to issue a 301 redirect header, however I am not sure if I can do that with a standard HTML page, since I don't want to change the page extension to asp because again that screws up the search engine results.

I also unfortunatly have no file/directory level access to IIS for this site, so any IIS setting for redirect is also a no go.

Are there any other options, or is the Meta tag refresh pretty much my only one?