Hi hmdeassis,
The Word Count 'Include textboxes, endnotes and footnotes' option applies at the document level only. In other words, for a given user, it can be different for different documents. There is no setting that can make it apply to all documents or all users. Conversely, if the setting has been activated in a given document, it should be remain that way when the same document is opened by another user.
You could make it the default setting for new documents by modifying the 'Normal' template, but that wouldn't affect existing documents.
Cheers
[MS MVP - Word]