Abstract: Activating an extension includes opening a first compose application by a first computing device. A composed document is received, and an extension is activated in response to the document. The extension may be activated as the document is being composed.

Abstract: Activating an extension includes opening a first compose application by a first computing device. A composed document is received, and an extension is activated in response to the document. The extension may be activated as the document is being composed.

Abstract: Activating an extension includes opening a first compose application by a first computing device. A composed document is received, and an extension is activated in response to the document. The extension may be activated as the document is being composed.

Abstract: Activating an extension includes opening a first compose application by a first computing device. A composed document is received, and an extension is activated in response to the document. The extension may be activated as the document is being composed.

Abstract: Activating an extension includes opening a first compose application by a first computing device. A composed document is received, and an extension is activated in response to the document. The extension may be activated as the document is being composed.

Abstract: An abstraction for one or more commands associated with a client application may be received upon deployment of a host application. The abstraction may be an extension with a same package and code such that the extension is enabled across a variety of platforms, host applications, and devices. For example, the extension may be displayed through a user interface of the host application based on definitions contained within the abstraction such that the extension is compatible with a platform and device on which the host application is deployed. The commands may be translated into graphical control elements, and displayed in conjunction with the extension based on the definitions. Upon invocation of one or more of the commands, an action may be performed based on the definitions enabling the client application to interact with content being created, edited, and/or viewed in the host application in an appropriate context.

Abstract: Activating an extension includes opening a first compose application by a first computing device. A composed document is received, and an extension is activated in response to the document. The extension may be activated as the document is being composed.

Abstract: When a user interface of a parent software application is modified such that user interface components of an add-in application are not compatible with the parent application user interface, user interface components associated with functionalities of the add-in application are added to the modified parent application user interface. A prior user interface of the parent application to which the add-in application user interface components are added is run in a background of the parent application and is not visible to users. User interface components in the parent application user interface are linked to corresponding add-in application user interface components in the prior user interface. Selection of a user interface component from the present user interface that is associated with an add-in application functionality causes selection of a corresponding user interface component in the background user interface, and the associated add-in functionality is executed.