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Such add-ins should instead declare the MobileLogEventAppointmentAttendee extension point. Appointment Attendee mode is supported for integrated add-ins created by providers of note-taking and customer relationship management (CRM) applications.See the Create an Outlook mobile add-in for an online-meeting provider article for more about this scenario. Appointment Organizer mode is supported for online meeting provider integrated add-ins which instead declare the MobileOnlineMeetingCommandSurface extension point.However, there are a couple of exceptions. That means MobileMessageReadCommandSurface is the only ExtensionPoint you should declare in the mobile section of your manifest. In general, only Message Read mode is supported at this time. Add-ins using the Unified Microsoft 365 manifest (preview) aren't currently supported on mobile devices.
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