object identifier,

object in Active Directory,

object in C and C++ programming,

object in Performance Monitor,

object in Windows NT and Windows 2000,

object linking and embedding (OLE),

Object Manager,

OBM,

OC-x,

ODBC,

ODBC logging,

ODI,

offline browsing,

Offline Files in Windows 2000,

offline folders in Microsoft Outlook,

OLAP,

OLE,

OLE DB,

OLE DB for OLAP,

online analytical processing (OLAP),

OnNow,

open database connectivity (ODBC),

Open Data-link Interface (ODI),

Open Shortest Path First (OSPF) Protocol,

Open Systems Interconnection (OSI) reference model,

OpenBSD,

optical carrier (OC-x) levels,

opto isolator,

Orange Book,

organization in Microsoft Exchange Server,

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