| Subject | English | Russian |
| comp., MS | X-header | X-заголовок (" An e-mail message header that begins with "X-".") |
| comp., MS | X-Header storage option | параметр хранения с X-заголовком (The option that adds an X-Header to the Internet header of spam messages. Information contained in this X-Header is specified by administrators in the Administration Center. Rori) |
| comp., MS | x-ua-compatible header | заголовок x-ua-compatible (An HTML header in which the HTTP-EQUIV property has a value of x-ua-compatible, which allows content to specify the document compatibility modes supported by the webpage) |