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O
object
A distinct entity represented by a series of attributes within Active Directory. An object can be a user, computer, folder, file, printer, and so on.
operations masters
Most Active Directory domain controller functions are multimaster, meaning any domain controller in the domain can handle the function at any given time. However, five roles are reserved as single-master: the PDC Emulator, Schema Master, RID Master, Infrastructure Master, and Domain Naming Master.
organization
Defines the common security context of a collection of Microsoft Exchange Server systems and their resources. An Active Directory forest can support a single Exchange Server 2003 organization, and an organization can be thought of conceptually as being like an Exchange Server–specific forest.
organizational unit (OU)
An Active Directory container object that allows an administrator to logically group users, groups, computers, and other OUs into administrative units. An OU is the smallest administrative unit in Active Directory that permissions can be assigned to.
OU
See organizational unit (OU).
Outlook Web Access (OWA)
A Microsoft Exchange Server feature that integrates with Internet Information Services (IIS) and allows mailbox-enabled users to log in and manage their mailboxes through a Web browser. OWA is not as full-featured as Microsoft Outlook but provides access to calendaring and groupware functionality not available through Post Office Protocol version 3 (POP3) and Internet Message Access Protocol 4 (IMAP4).
