N

Name Service Provider Interface (NSPI)

Part of the DSProxy process that can accept Outlook client directory requests and pass them to an address book provider.

namespace

A logical collection of resources that can be managed as a single unit. Within Active Directory, a domain defines a namespace.

naming partition

A self-contained section of a directory hierarchy that has its own properties, such as replication configuration and permissions structure. Active Directory includes the domain, configuration, and schema naming partitions.

native content file

See rich text file.

native mode

A one-time, irreversible selection for Exchange 2003 in which the Exchange platform is configured to operate without accounting for any previous versions of Exchange in the organization. Once selected, earlier versions of Exchange will not be compatible with Exchange 2003 Server.

NDR

See non-delivery report (NDR).

network load balancing (NLB)

The process of balancing client calls between multiple front-end servers. This activity takes place at the MAC and network layers.

Network News Transfer Protocol (NNTP)

A standards-based protocol that includes simple command verbs to transfer Usenet messages between clients and servers as well as between servers. NNTP uses TCP/IP port 119.

NLB

See network load balancing (NLB).

NNTP

See Network News Transfer Protocol (NNTP).

non-delivery report (NDR)

A report generated when a message is not deliverable for some reason in Exchange Server. The NDR is returned to the message sender and sometimes to an administrator or automated monitor as well.

NSPI

See Name Service Provider Interface (NSPI).