mail app: An app for Office that enhances an email or appointment item.
mail tip: A note that is presented to the author of a message when the author is composing the message. A mail tip provides information about the recipients of a message and issues that might impact delivery of the message, such as moderation or delivery restrictions.
mail user: An Address Book object that represents a person or entity that can receive deliverable messages.
Mail User Agent (MUA): A client application that is used to compose and read email messages.
mailbox: A message store that contains email, calendar items, and other Message objects for a single recipient.
marker: An unsigned 32-bit integer value that adheres to property tag syntax and is used to denote the start and end of related data in a FastTransfer stream. The property tags that are used by markers do not represent valid properties.
meeting: An event with attendees.
Meeting Cancellation object: A Message object that represents a meeting organizer's cancellation of a previously scheduled meeting.
Meeting Forward Notification object: A Message object that represents a notification that is sent to the meeting organizer when an attendee forwards a meeting request.
Meeting object: A Calendar object that has both an organizer and attendees.
meeting request: An instance of a Meeting Request object.
Meeting Request object: A Message object that represents an invitation from the meeting organizer to an attendee.
Meeting Response object: A Message object that represents an attendee’s response to a meeting organizer's invitation. The response indicates whether the attendee accepted, tentatively accepted, or declined the meeting request. The response can include a proposed new date or time for the meeting.
meeting update: An instance of a Meeting Update object.
Meeting Update object: A Message object that represents a meeting organizer's changes to a previously scheduled meeting. The update is categorized as either a full update or an informational update.
Meeting Workspace: A website that is created by using the Meetings Web Services protocol, as described in [MS-MEETS]. It can host documents, discussions, and other information about a meeting.
meeting-related object: A Message object that represents a relay of information between a meeting organizer and an attendee. It can be any of the following: Meeting Request object, Meeting Update object, Meeting Cancellation object, or Meeting Response object.
message body: (1) The content within an HTTP message, as described in [RFC2616].
(2) The main message text of an email message. A few properties of a Message object represent its message body, with one property containing the text itself and others defining its code page and its relationship to alternative body formats.
message class: A property that loosely defines the type of a message, contact, or other Personal Information Manager (PIM) object in a mailbox.
Message object: A set of properties that represents an email message, appointment, contact, or other type of personal-information-management object. In addition to its own properties, a Message object contains recipient properties that represent the addressees to which it is addressed, and an attachments table that represents any files and other Message objects that are attached to it.
message part: A message body (2) with a string property that contains only the portion of an email message that is original to the message. It does not include any previous, quoted messages. If a message does not quote a previous message, the message part is identical to the message body.
message store: A unit of containment for a single hierarchy of Folder objects, such as a mailbox or public folders.
message transfer agent (MTA): An SMTP server that accepts mail from a client or another MTA and delivers the mail or relays it to another MTA.
Messaging Application Programming Interface (MAPI): A messaging architecture that enables multiple applications to interact with multiple messaging systems across a variety of hardware platforms.
messaging object: An object that exists in a mailbox. It can be only a Folder object or a Message object.
MetadataObject: An abstract data structure that consists of a set of attributes (1) that represent a LobSystem, LobSystemInstance, DataClass, Entity, Method, MethodInstance, Parameter, TypeDescriptor, Identifier, FilterDescriptor, Action, ActionParameter, or Association.
metafile: A file that stores an image as graphical objects, such as lines, circles, and polygons, instead of pixels. A metafile preserves an image more accurately than pixels when an image is resized.
MethodInstance: A type of MetadataObject that associates a normalized or stereotypical semantic with a Method that represents a native API in a line-of-business (LOB) system. MethodInstances identify which part of the data that is returned by a Method is relevant for the semantic by defining a ReturnTypeDescriptor. MethodInstances are contained by Methods.
MIME body: The content of a MIME entity, which follows the header of the MIME entity to which they both belong.
MIME content-type: A content type that is as described in [RFC2045], [RFC2046], and [RFC2047].
MIME Encapsulation of Aggregate HTML Documents (MHTML): A MIME-encapsulated HTML document, as described in [RFC2557].
MIME entity: An entity that is as described in [RFC2045], [RFC2046], and [RFC2047].
MIME message: A message that is as described in [RFC2045], [RFC2046], and [RFC2047].
MIME part: A message part that is as described in [RFC2045], [RFC2046], and [RFC2047].
Minimal Entry ID: A property of an Address Book object that can be used to uniquely identify the object.
multibyte character set (MBCS): A mixed-width character set (1) in which some characters are encoded into more than 1 byte. A multibyte character set (MBCS) is used in languages such as Japanese, Chinese, and Korean, where the 256 possible values of a single-byte character set are not sufficient to represent all possible characters.
Multimedia Messaging Service (MMS): A communications protocol that is designed for messages containing text, images, and other multimedia content that is sent between mobile phones.
Multipurpose Internet Mail Extensions (MIME): A set of extensions that redefines and expands support for various types of content in email messages, as described in [RFC2045], [RFC2046], and [RFC2047].
multivalue property: A property that can contain multiple values of the same type.