O's

O - Organization
OA&M- Operations Administration & Maintainance
OAG - Open Applications Group
OCE - Open Collaboration Environment
OCIS- Organized Crime Information System
OCR - Optical Charachter Recognition
ODBC- Open Database Compliant
ODI - Open Data-Link Interface
ODN - OutDial Notification
ODSI- Open Directory Service Interface
OEM - Original Equipment Manufacturer
OFDM- Orthogonal Frequency Division Multiplexing
OL- Ordered List
OLAP- Online Analytical Processing
OLE - Object Linking and Embedding
OMR - Optical Mark Recognition
ONE - Open Network Environment
ONMS- Open Network Management System
ONU - Optical Networking Unit
OPC - Organic Photoconducting Cartridge
OPT - Open Protocol Technology
ORMS- Operating Resource Management System
OS- Operating System
OS/2- Operating System / 2
OSF - Open Software Foundation
OSI - Open Systems Interconnection
OSI - Open Standards Interconnection
OSPF- Open Shortest Path First
OSR - OEM System Release
OT- Open Transport
OU- Organizational Unit
OURS- Open User-Recommended Solutions