Index_H

H

hackers, 516, 518–21

hard delete, 273

hard page faults, 633

hardware

categories of, 132–34

optimizing through configuration, 144

requirements for installation, 141, 142

hardware and software compatibility lists, 142

hardware installation and support personnel, 307

hardware-based RAID, 133

Hash Algorithms option, 548

hashes, comparing for digital signature verification, 563

HEAD NNTP command, 459

header section of a log file, 34

HELO SMTP command, 289, 426, 427

help desk support staff, 307

Help menu, 162

HELP SMTP command, 427

help with Exchange problems, 623–24

helpful hackers, 517

hexadecimal numbering, naming generations, 34

Hide from Exchange Address Lists option, 188

Hide Group From Exchange Address Lists option, 197

hierarchical physical network structure, 130

hierarchical placement in X.400, 472

high-bandwidth connectivity, 276

higher-cost links, rerouting messages over, 296

high-priority messages, sending to X.400 systems, 188

high-speed connections, administrative model and, 259

high-speed links, forming sites, 82

high-speed PCI adapters, 134

historical record, maintaining, 590

home-grown applications, testing, 507

host names, 103, 104

host records. See A records

hosting of multiple businesses, 238

hosts, 103

Hosts file, 104

hot fixes, 142

HTML viruses, 520

HTTP client, 23

HTTP protocol, 39

HTTP virtual server

adding a new, 414

in the Exchange System Manager, 410

hub-and-spoke topology, 60