When importing content from MicroSoft Word, it is highly recommended to use either the Paste as Plain Text or Paste from Word feature (see image below depicting where these icons are located). Word is notorious about adding proprietary code to webpages. Using the Paste as Plain Texas or Paste from Word strips out that code to create cleaner html.
Another HUGE concern are viruses being transported from a user’s computer to a web server. Viruses are often transmitted through MicroSoft products.