Microsoft 1 manual Group, Hash Functions, Installable File System IFS, Instant Messaging IM

104Microsoft Exchange 2000 Operations Guide — Version 1.0

(MMC) snap-in. There is only one policy for global catalog attribute replication in the forest. A global catalog will listen on port 3268 for LDAP queries (that are global to the forest), and port 389, which standard domain controllers use (for local domain queries).

A domain controller can be made into a global catalog (and vice versa) by selecting or deselecting a check box in the Active Directory Sites and Services MMC snap-in.

Group

An object defined in Active Directory that contains members of other objects such as users, contacts, and possibly other groups. A group may be one of two types, either distribution or security depending on the requirement, and have a scope of either local, domain, or universal. This is similar to a distribution list in Exchange Server 5.5.

Hash Functions

A hash function provides a means of computing an electronic fingerprint, or checksum of a message. This electronic fingerprint is called the hash of a message.

Hashing secures messages and private key data by using them as elements in a mathemati- cal function that creates a checksum of the package. The algorithm is then used on the receiving end to decrypt the message. Hashes typically compute quickly, and are designed so that every imaginable message can have a unique hash. Hash algorithms include MD-4, MD-5, and SHA-1

Hosted organization (also known as virtual server, virtual machine, virtual organization)

A collection of Exchange services including, but not limited to virtual servers (that is, instances of IMAP4, SMTP, POP3, NNTP, HTTP, RVP), storage space, and real-time collaboration facilities that exist to serve the needs of a single company. A hosted organization is normally used by Internet Service Providers to host multiple companies on the same physical computer. However, a hosted organization is not limited to a single server running Exchange 2000.

HTTP-DAV

See Distributed Authoring and Versioning.

Installable File System – IFS

See Web Storage System

Instant Messaging – IM

The Exchange 2000 service that allows for real-time messaging and collaboration between users. Clients generally use the MSN Messenger client to log on to Instant Messaging and subscribe to other users.

Instant Messaging Presence Protocol – IMPP

The standards-based protocol clients use to interact with an Instant Messaging server. IMPP is being developed by leading vendors, including Microsoft and Lotus. The Instant