Windows Open Services Architecture (WOSA) is a set ofproprietaryMicrosoft technologies intended to "...provide a single, open-ended interface to enterprise computing environments.".^[1] WOSA was announced by Microsoft in 1992.^[2] WOSA was pitched as a set of programming interfaces designed to provide application interoperability across the Windows environment.

The set of technologies that were part of the WOSA initiative include:^[3]

• LSAPI (Software Licensing API)
• MAPI (Mail Application Programming Interface)
• ODBC^[4] (Open Database Connectivity)
• OLE for Process Control
• SAPI (Speech Application Programming Interface)
• TAPI (Telephony Application Programming Interface)
• Windows SNA (IBM SNA Networks)
• WOSA/XFS (WOSA for Financial Services)
• WOSA/XRT (WOSA for Real-time Market Data)

• Component Object Model
• Object Linking and Embedding

• Inter-process communication
• Windows communication and services
• Architectural pattern (computer science)
• Enterprise application integration
• Service-oriented (business computing)
• Web services
• Component-based software engineering