windows people
Summary
Microsoft now supports pinning conversations within applications to the taskbar through what they call the My People API:
https://docs.microsoft.com/en-us/windows/uwp/contacts-and-calendar/my-people-support
It looks like it primarily supports windows store apps/c#, so it might not be possible to do with electron/node. It's also OS-specific, which isn't really beneficial to the app as a whole.
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