g1smd - 6:12 pm on May 16, 2008 (gmt 0)

IIS will serve the same content whatever case you use. That can cause you to have Duplicate Content problems: all versions serve up as "200 OK".

Apache IS case sensitive. Wrong case should give "Error 404". If you want, you can set up a 301 redirect to redirect to the correct case, so that you don't lose the traffic. Personally I don't bother. There are more important Duplicate Content and canonicalisation issues to be fixed first.

If you stick with all-lower-case for valid URLs you'll never hit the problem of miscommunication.

I always avoid mixed-case URLs.

Domain name is always case insensitive. What we are talking about here is folder and file names.

[edited by: g1smd at 6:14 pm (utc) on May 16, 2008]