404 errors received when opening links via Microsoft Office applications generate a The Internet site reports that the item you requested could not be found (HTTP/1.0 404) message inside the MS Office program.
403 errors, like all errors of this type, might be seen in any browser on any operating system.
405 errors often arise with the POST method. You may be trying to introduce some kind of input form on the Web site, but not all ISPs allow the POST method necessary to process the form.