The Microsoft OS/2 SDK includes pre-release builds of OS/2, beta development tools, sample code, and loads of documentation. These were released prior to the OS/2 1.0 and 1.1 releases. Microsoft charged $3,000 in 1987 for the SDK. It was criticized as overpriced, buggy, and slow.
These were superseded by the smaller and less expensive Microsoft OS/2 Programmer's Toolkit
Much more information can be found here: OS/2 Museum, OS/2 Beginnings
April 1989 - SDK 1.10
This was the final standalone SDK, as development support was moved in to Microsoft's mainstream commercial programming products, or add on development products including:
Download name | Version | Language | Architecture | File size | Downloads |
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1.10 (Apr 1989) | English |
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15.81MB | 1 |