Indexing external content with a case sensitive URL
There is currently a bug in MOSS 2007 search that automatically converts any URLs entered to lower-case.
We had a site hosted on a UNIX server that had a case sensitive URL, so when I entered http://server.net/Start/Welcome.html MOSS 2007 converted it to http://server.net/start/welcome.html and then tried to crawl this URL, but UNIX would return a “page could not be found” error.
Microsoft provided us with a hotfix for this, so if you have the same problem I suggest you raise a support request. :-)