Apple Open Collaboration Environment

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Apple Open Collaboration Environment (AOCE) is a collection of messaging-related technologies introduced for the Classic Mac OS in the early 1990s. It includes the PowerTalk mail engine, which is the primary client-side interface to the system, the PowerShare mail server for workgroup installations, and a number of additional technologies such as Open Directory, encryption, and digital signature support.

AOCE and PowerTalk were heavily marketed between 1993 and 1996, but the hardware requirements meant that most users couldn't even install or use it. Developers were likewise stymied by the complex system, and since the installed base was so small their potential sales were even smaller. In 1996, Apple Computer quietly dropped its efforts to market AOCE, and the project quickly disappeared.