R

random failover

In this cluster operation mode, the clustered resource will be randomly failed over to an available cluster node.

recipient

An object that can receive a message. Recipient objects include users, contacts, groups, and public folders.

recipient policies

See policy.

recovery server

A server separate from the organization that is used as a dummy server for recovering individual mailboxes or messages from a backup.

Recovery Storage Group

A new feature in Exchange Server 2003 that provides a special storage group on a server that can be used for performing restorations without the need to use an alternative recovery forest or the need to take the store offline for an extended period of time.

Relative Identity (RID) master

An operations master role server that is responsible for maintaining the uniqueness of every object within its domain. When a new Active Directory object is created, it is assigned a unique security identifier (SID). The SID consists of a domain specific SID that is the same for all objects created in that domain and a relative identifier (RID), which is unique amongst all objects within that domain

replica

A copy of a public folder located on an Exchange server.

replication

The transferring of a copy of data to another location, such as another server or site. See also directory replication, public folder replication.

remote delivery

The delivery of a message to a recipient that does not reside on the same server as the sender.

Remote Procedure Call (RPC)

A set of protocols for issuing instructions that can be sent over a network for execution. A client computer makes a request to a server computer, and the results are sent to the client computer. The computer issuing the request and the computer performing the request are separated remotely over a network. RPCs are a key ingredient in distributed processing and client/server computing. See also Local Procedure Call (LPC).

reserve log files

Two transaction log files created by Exchange Server that are reserved for use when the server runs out of disk space.

resolving an address

The process of determining where (on which physical server) an object with a particular address resides.

resource group

Functions in a cluster that are not bound to a specific computer and can fail over to another node.

rich-text (EBD) file

The database used by Exchange Server to store general messages and attachments.

Rich-Text Format (RTF)

A Microsoft format protocol that includes bolding, highlighting, italics, underlining, and many other format types.

role

A group of permissions that define which activities a user or group can perform with regard to an object.

root CA

Resides at the top of a Certificate Authority hierarchy; is trusted unconditionally by a client. All certificate chains terminate at a root CA. See also Certificate Authority (CA).

root domain

The top domain in a domain tree.

routing group

A collection of Exchange servers that have full-time , full-mesh, reliable connections between each and every server. Messages sent between any two servers within a routing group are delivered directly from the source server to the destination server.

Routing Group Connector (RGC)

The primary connector used to connect routing groups in an organization. The RGC uses SMTP as its default transport mechanism.

Routing Group Master

A server that maintains data about all of the servers running Exchange Server 2003 in the routing group.

RPC over HTTP

A new mode of connecting remote Outlook 2003 clients to an Exchange Server 2003 organization without requiring the use of a Virtual Private Network (VPN) or Outlook Web Access (OWA). RPCs are passed over the HTTP connection and secured with SSL encryption. Basic authentication is used to authenticate the user and is also protected by the SSL.

rule

A set of instructions that define how a message is handled when it reaches a folder.