O

object

An entity that is described by a distinct, named set of attributes. In Active Directory, all network resources are represented as objects that can be centrally administered.

OLE DB

An API that allows low-level programming languages such as C and C++ to access dissimilar data stores through a common query language. OLE DB is seen as the replacement for open database connectivity (ODBC). Data stores such as those in Exchange and SQL Server allow for OLE DB access, which makes application development easier and faster.

OMA

See Outlook Mobile Access (OMA).

organizational unit (OU)

An Active Directory container object that is used to organize other objects within a domain. An OU can contain user accounts, printers, groups, computers, and other OUs.

OU

See organizational unit (OU).

Outlook Mobile Access (OMA)

Provides users with mobile devices such as Pocket PCs and Smartphones real-time access to Exchange data. Outlook Mobile Access allows access only while connected.

Outlook Web Access (OWA)

The Web browser interface to Exchange Server mailbox and public folder data. The OWA client in Exchange Server 5.x uses Active Server Pages to render collaboration data into HTML, whereas the OWA client in Exchange 2000 uses native access to the store.

OWA

See Outlook Web Access (OWA).