failoverA cluster's ability to redirect requests from one server to another. Failover occurs when a user tries to access an application on an unavailable server…
fallback actionThe action that an Exchange Server 2007 transport rule takes if a disclaimer cannot be applied to an e-mail message as, for example, when a message is…
false positivetest result that states that an analyte is present, when, in fact, it is not present or, is present in an amount less than a threshold or designated…
fan outThe process of splitting a message to deliver e-mail messages to individual recipients. [Exchange 2007]
fan-out threadA thread that creates multiple message copies and places them in the appropriate link queues.
Fault-ToleranceThe ability of a processor to maintain mission effectiveness after some subsystems failed.
file share witnessA new type of Majority Node Set (MNS) quorum in Windows Server 2003. In Exchange Server 2007, cluster continuous replication (CCR) uses the MNS quorum…
FirewallA set of related programs that protect the resources of a private network from users from other networks.
folder treeA hierarchical display of folder organization.
Foreign connectorAn Exchange Server 2007 connector that uses a Drop directory on a Hub Transport server to send messages to a local messaging server that doesn't use the…
foreign gateway connection handlerIn Exchange Server 2007, a component of the Microsoft Exchange Transport service that manages delivery of messages to Drop directories that are configured…
foreign systemA messaging system other than Exchange. [Exchange 5.5]
ForestTerrestrial ecosystem (biome) with enough average annual precipitation (at least 76 centimeters or 30 inches) to support growth of various species of…
ForestPrepA tool that is used during deployment to extend the Active Directory schema to include Exchange-specific classes and attributes.
formThe mass or shape of an object or objects that appears unified, such as a vegetative opening in a forest, a cliff formation, or a water tank.
forms-based authenticationForms-based authentication provides a Web logon screen for users to authenticate to gain access to their mailboxes when using Microsoft Outlook Web Access.
FQDN (fully qualified domain name)A Domain Name System (DNS) that has been stated unambiguously to indicate with certainty its location in the domain namespace tree.
free/busy statusThe availability of a person. In addition to free and busy, the status can also be out-of-office (OOF) or tentative. [Exchange 2003]
Front-end/back-endAn Exchange 2000 configuration in which clients access a bank of protocol servers (the front-end) for collaboration information, and these in turn…
front-end/back-end architectureAn Exchange configuration where clients access a bank of protocol servers (the front-end) for collaboration information, and then these servers…
FRS (File Replication Service)A multimaster replication service that is used replicate files and folders between servers. [Exchange 2007]
full mesh topologyA network architecture in which each network segment can reach any other network segment directly through a point-to-point physical or logical connection.