SEOMOZ say's: I have six (6) duplicate pages.
Duplicate content tool checker say's (0)
On the physical computer that hosts the website the page exists as one file. The casing of the file is irrelevant to the host machine, it wouldn't allow 2 files of the same name in the same directory.
To reenforce this point, you can access said file by camel-casing the URI in any fashion (eg; http://www.agi-automation.com/Pneumatic-grippers.htm). This does not bring up a different file each time, the server merely processes the URI as case-less and pulls the file by it's name.
What is happening in the example given is that some sort of indexer is being used to create a "dummy" reference of all the site files. Since the indexer doesn't have file access to the server, it does this by link crawling instead of reading files. It is the crawler that is making an assumption that the different casings of the pages are in fact different files. Perhaps there is a setting in the indexer to ignore casing.
So the indexer is thinking that these are 2 different pages when they really aren't. This makes all of the other points moot, though they would certainly be relevant in the case of an actual duplicated page."
****Page Authority Linking Root Domains
http://www.agi-automation.com/ 43 82
http://www.agi-automation.com/index.html 25 2
http://www.agi-automation.com/Linear-escapements.htm 21 1
www.agi-automation.com/linear-escapements.htm 16 1
http://www.agi-automation.com/Pneumatic-grippers.htm 30 3
http://www.agi-automation.com/pneumatic-grippers.htm 16 1****
Duplicate content tool estimates the following:
- www and non-www header response;
- Google cache check;
- Similarity check;
- Default page check;
- 404 header response;
- PageRank dispersion check (i.e. if www and non-www versions have different PR).