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One of the notable thinkers involved in creating the COM architecture was Anthony Williams, who embraced the concept of software components in his papers Object Architecture: Dealing With the Unknown - or - Type Safety in a Dynamically Extensible Class, 1988 and On Inheritance: What It Means and How To Use It, 1990.
Microsoft's earliest object-based technology was Object Linking and Embedding (OLE) 1.0, which was built on top of dynamic data exchange (DDE) and designed specifically for compound documents. It was introduced with Word for Windows and Excel in 1991, and was later included with Windows, starting with version 3.1 in 1992. Also in 1991, Microsoft introduced Visual Basic controls, or VBX, with Visual Basic 1.0.
In 1993, Microsoft released OLE 2, and created COM as the underlying object model for OLE 2. While OLE 1 was focused on compound documents, COM and OLE 2 were designed to address software components in general. In 1994 OLE controls ( OCX) were introduced as the successor to VBX controls. At the same time, Microsoft stated that OLE 2 would just be known as "OLE", and that OLE was no longer an acronym, but a name for all of the company's component technologies.
In early 1996 Microsoft renamed some parts of OLE relating to the Internet ActiveX, and then gradually renamed all OLE technologies as ActiveX, except compound document technology as used in Microsoft Office. Later that year, DCOM was introduced as an answer to CORBAIn computing, Common Object Request Broker Architecture or CORBA is a standard for software componentry. The CORBA standard is created and controlled by the Object Management Group (OMG). It defines APIs, communication protocol, and object/service informa.
While COM had been around since 1993, Microsoft started emphasizing the name COM more around 1997.
With Windows 2000Microsoft Windows 2000 (also referred to as Win2K is a 32-bit graphical business-oriented operating system released on February 17, 2000 by the Microsoft Corporation. Windows 2000 comes in four versions: Professional Server Advanced Server and Datacenter, a significant extension to COM named COM+ was introduced. At the same time, Microsoft de-emphasized DCOM as a separate entity.
of COM+ was that it could be run in "component farms", managed with the built-in Microsoft Transaction Server. A component, if coded properly, could be reused by new calls to its initializing routine without unloading it from memory. Components could also be distributed (called from another machine) as was previously only possible with DCOM.
The COM platform has largely been superseded by the Microsoft .NET initiative. Although COM remains a viable technology (and Microsoft has no plans of discontinuing it), the company is now focusing its marketingMarketing is the craft of linking the producers (or potential producers) of a product or service with customers, both existing and potential. Some form of marketing arises naturally in all capitalist societies but is not limited to capitalist societies. efforts on .NET.
There exists a limited backward compatibility in that a COM object may be used in .NET by implementing a runtime callable wrapper (RCW), and .NET may use COM objects by calling a COM callable wrapper. Additionally, several of the services that COM+ provides, such as transactions and queued componentsFor queueing people, see queue area. In providing services to people, and in computer science, transportation, and operations research a queue is a First-In-First-Out FIFO process — the first element in the queue will be the first one out. This is equival, are still important for enterprise .NET applications.
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