How much does URLs with CAPS and URLs with non-CAPS existing on an IIS site matter nowadays?

[OfficeFurn]

I work on a couple ecommerce sites that are on IIS. Both sites have return a 200 header status for the CAPS and non CAPS version of the URLs. While I suppose it would be ok if the canonicals pointed to the same version of the page, in some cases it doesn't (ie; /Home-Office canonicalizes to itself and /home-office canonicalizes to itself). I came across this article (http://www.searchdiscovery.com/blog/case-sensitive-urls-and-seo-case-matters/) that is a few years old and I'm wondering how much of an issue it is and how I would determine if it is/isn't?

[OlegKorneitchouk]

Check to see if they are both in the index (or 1 is in supplemental index). If so, it's an issue.

In general, capitalization does mean a different url (think of all of the link shorteners that user a mix or upper and lower case letters in order to differentiate)