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You can create compose add-ins, which are Outlook add-ins activated in compose forms. In contrast with read add-ins (Outlook add-ins that are activated in read mode when a user is viewing a message or appointment), compose add-ins are available in the following user scenarios.
Composing a new message, meeting request, or appointment in a compose form.
Viewing or editing an existing appointment, or meeting item in which the user is the organizer.
Composing an inline response message or replying to a message in a separate compose form.
Editing a response (Accept, Tentative, or Decline) to a meeting request or meeting item.
Proposing a new time for a meeting item.
Forwarding or replying to a meeting request or meeting item.
In each of these scenarios, any add-in command buttons defined by the add-in are shown in compose form.
Types of add-ins available in compose mode
Compose add-ins are implemented as add-in commands. To activate add-ins for composing email or meeting responses, add-ins include a MessageComposeCommandSurface extension point element in the manifest. To activate add-ins for composing or editing appointments or meetings where the user is the organizer, add-ins include a AppointmentOrganizerCommandSurface extension point element. For more information on manifests, see Office Add-in manifests.
Note
Add-ins developed for servers or clients that don't support add-in commands define activation rules using the Rule element contained in the OfficeApp element. Unless the add-in is being specifically developed for older clients and servers, new add-ins should use add-in commands.
Add-ins that use activation rules aren't supported in an add-in that uses a Unified manifest for Microsoft 365.
API features available to compose add-ins
- Add and remove attachments to an item in a compose form in Outlook
- Get, set, or add recipients when composing an appointment or message in Outlook
- Get or set the subject when composing an appointment or message in Outlook
- Insert data in the body when composing an appointment or message in Outlook
- Get or set the ___location when composing an appointment in Outlook
- Get or set the time when composing an appointment in Outlook
- Manage the sensitivity label of your message or appointment in compose mode
- Manage the delivery date and time of a message
See also
Collaborate with us on GitHub
The source for this content can be found on GitHub, where you can also create and review issues and pull requests. For more information, see our contributor guide.
Office Add-ins