read receipt: An email message that is sent to the sender of a message to indicate that a message recipient received the message.
Really Simple Syndication (RSS): An XML-based syndication format for content, as described in [RSS2.0].
Receive folder: A Folder object that is configured to be the destination for email messages that are delivered.
recipient: (1) An entity that can receive email messages.
(2) An entity that is in an address list, can receive email messages, and contains a set of attributes (1). Each attribute has a set of associated values.
recipient information cache: An information store that contains a list of the contacts (3) with whom a user has interacted most often and most recently, and with whom the user is likely to interact again.
Recipient object: A set of properties that represent the recipient of a Message object.
recipient table: The part of a Message object that represents users to whom a message is addressed. Each row of the table is a set of properties that represents one recipient (2).
recurrence BLOB: The binary large object (BLOB) encoding of a recurrence pattern, a recurrence range, and recurrence exceptions.
recurrence part: A name/value pair in a property of type Recurrence Rule, as described in [RFC2445].
recurrence pattern: Information for a repeating event, such as the start and end time, the number of occurrences, and how occurrences are spaced, such as daily, weekly, or monthly.
recurrence range: The range of time for which a recurrence pattern continues.
Recurring Calendar object: A Calendar object that describes an event that repeats according to a recurrence pattern.
recurring series: An event that repeats at specific intervals of time according to a recurrence pattern.
recurring task: A series of Task objects that are described by a recurrence pattern.
red-green-blue (RGB): A color model that describes color information in terms of the red (R), green (G), and blue (B) intensities in a color.
reminder: A generally user-visible notification that a specified time has been reached. A reminder is most commonly related to the beginning of a meeting or the due time of a task but it can be applied to any object type.
reminder properties: A set of properties that specify the attributes of a reminder. These attributes include the time at which and the method by which a reminder is signaled or displayed.
remote operation (ROP): An operation that is invoked against a server. Each ROP represents an action, such as delete, send, or query. A ROP is contained in a ROP buffer for transmission over the wire.
remote user: (1) A user who has a persistent identity within an enterprise and is connected from outside the enterprise network boundary.
(2) An Address Book object known to be from a foreign or remote messaging system.
replica: (1) A server that hosts an instance of a message item in a folder.
(2) A copy of the data that is in a user's mailbox at a specific point in time.
replica GUID (REPLGUID): A value that represents a namespace for identifiers. If a REPLGUID is combined with a GLOBSET, the result is a set of global identifiers. A REPLGUID value has an associated replica ID (REPLID) that is used in its place on disk and on the wire.
replica ID (REPLID): A value that is mapped to a replica GUID (REPLGUID) that identifies a namespace for IDs within a given logon. REPLIDs are used on disk and on the wire for compactness, and are replaced with the corresponding REPLGUID for external consumption.
required attendee: An attendee of an event whom the organizer lists as a mandatory participant.
Resource object: An Address Book object that represents an asset that can be reserved, such as a room or equipment.
response message: A Traversal Using Relay NAT (TURN) message that is sent from a protocol server to a protocol client in response to a request message. It is sent when the request message is handled successfully by the protocol server.
restriction: (1) A set of conditions that an item meets to be included in the search results that are returned by a query server in response to a search query.
(2) A filter used to map some domain into a subset of itself, by passing only those items from the domain that match the filter. Restrictions can be used to filter existing Table objects or to define new ones, such as search folder (2) or rule criteria.
retention policy: A policy that specifies the length of time during which data, documents, and other records must be available for recovery.
retention tag: An element that contains information about the retention policy of a Message object or folder.
ReturnTypeDescriptor: An attribute (1) of a MethodInstance. It is the TypeDescriptor that identifies the portion of a Method's return or output Parameters to extract and return as the result of executing the MethodInstance. It defines the View of the EntityInstances returned, with its child TypeDescriptors denoting the Fields of the View.
Rich Text Format (RTF): Text with formatting as described in [MSFT-RTF].
rights: Tasks that a user is permitted to perform on a computer, site, domain, or other system resource. See also permission.
rights policy template: An XrML 1.2 document that contains a predefined usage policy that is used to create a publishing license when content is protected.
rights-managed email message: An email message that specifies permissions that are designed to protect its content from inappropriate access, use, and distribution.
Root folder: The special folder that is the top-level folder in a message store hierarchy. It contains all other Folder objects in that message store.
ROP buffer: A structure containing an array of bytes that encode a remote operation (ROP). The first byte in the buffer identifies the ROP. This byte is followed by ROP-specific fields. Multiple ROP buffers can be packed into a single remote procedure call (RPC) request or response.
ROP request: See ROP request buffer.
ROP request buffer: A ROP buffer that a client sends to a server to be processed.
ROP response: See ROP response buffer.
ROP response buffer: A ROP buffer that a server sends to a client to be processed.
RSS item: An item element in an RSS feed, as described in [RSS2.0].
RSS object: A Message object that represents an entry from an RSS item or atom feed.
rule: (1) A condition or action, or a set of conditions or actions, that performs tasks automatically based on events and values.
(2) A set of qualifiers, such as enumeration values, and quantifiers, such as numeric arguments, that are specified as usage guidelines for a set of objects or data.
(3) A mapping of a file type to a location in a document repository.
Rule FAI message: A folder associated information (FAI) message stored in the Inbox special folder where the client can store extra rule-related information that is opaque to the server.