| Subject | German | English |
| comp., MS | X-Header | X-header (" An e-mail message header that begins with "X-".") |
| comp., MS | X-Header-Einstellungen | X-Header storage option (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) |
| comp., MS | X-UA-kompatibler Header | x-ua-compatible header (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) |