Once a very little digging up, I found enough evidence to believe that…

1. Google searches are never case sensitive – as we tend to already knew.
2. Google PR is case sensitive – as I suspected, in line with net standards, URLs are case sensitive. Google and other search engines follow this standard.

There have been some reported cases of the same pages being in Google’s index a pair of or a lot of times because they were linked to with different cases (ie.: /ABC.htm, /abc.htm, /Abc.htm).

The root of the matter, as you will have guessed, is Microsoft’s ignorance towards web standards. Microsoft servers are set up in opposition to the net normal on case sensitivity in which /ABC.htm is different from /abc.htm. IIS ignores the case different and provides management of the request to wrong file.

My web site is on a Windows Server, how unhealthy is the matter?
Well, it is not visiting ‘bring down the internet’ as some lammers would possibly recommend, however there are issues that need to be addressed. IIS’s alternative to ignore case sensitivity suggests that search engines (that are case sensitive) can index the exact same content for various URLs. It’s very unlikely a website would be penalized for this, however it can definitelly impair your web site’s ability to rank well. It makes it specially difficult for the duplicated page to rank well for the terms it targets.

This is only an issue if there are two or a lot of links purpose to the same URL during a completely different case. You’ll be able to avoid this problem by perpetually using lowercase in your link tags, but you cannot stop other websites linking into the same URL in capital letters – therefore something should be done on the server in order to deal with this issue.

How can I fix it?
I will almost picture you “URL Rewrite Junkies” jumping up and down with the answer on your hands, however as we have a tendency to all grasp, URL Rewrite is a feature only available to correct net-servers, nothing you’d expect to see in IIS.

A. Server Component (IIS alternative to URL Rewrite)
Not free, not straightforward to setup and will only be put in on your own server. The sole upside is that this might work for all files/scripts/directories on the website.

B. Script (and a very little permanent redirection)
It’s free, it is simple to setup and can be put in on any server, not simply your own. The sole downside is that you can only enforce case sensitiveness for requests that are handled by this script. This implies static HTML pages, directories, images, etc would still be exposed to the current issue. HOWEVER, if with a very little help from a custom 404 error page you can do just regarding anything. But that is an entire different topic…

Here’s how you’d enforce case sensitiveness using VB Script:
Code: If Request.ServerVariables(“URL”)LCase(Request.ServerVariables(“URL”)) Then
Response.Standing = 301 ‘Permanently Redirected
Response.AddHeader “Location”, LCase(Request.ServerVariables(“URL”))
Response.Finish()
Finish If
%> It does not would like to be the terribly first issue on every page, but in order to perform a correct permanent redirect, this must be execute before any content is written to the response’s output stream, ie.: Before any HTML or Response.Write.

Hope this helps some up-and-returning SEO experts (and wanna-bes)

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