M

machine.config

A systemwide .NET configuration settings file.

metadata

In the context of Web services, information about the Web service as a whole (contained in WSDL and UDDI) and the context of a message between service and client (contained in SOAP and HTTP headers).

Microsoft Discovery (DISCO)

A Microsoft-only alternative to UDDI.

Multipurpose Internet Mail Extensions (MIME)

An Internet standard that defines the format of a message and its contents. The MIME type for SOAP messages is currently text/xml, although the SOAP 1.2 standard suggests changing this to application/soap.