One of our primary goals is to create a AAA email client that behaves like you expect an email client to. A second goal is to inject collaboration in the email experience. Those two goals make Missive a perfect candidate for email support.
Excellent. I'll give your product a try and email you if I have feedback :)
You're not really answering the question here, you're just stating fairly vague goals. I guess I should be more specific: Do you have a good featureset for support inboxes (such as Assignees, internal notes, open/closed requests, ticket merging, product teams with auto categorization for different email/Twitter accounts, ...) or would using Missive for support inboxes be more of a hack?