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We're working on a proxy that will work with any IMAP server that of course will work with Cyrus. I think its likely that we'll look into building support directly into Cyrus at some point but we don't have any concrete plans yet.

http://git.cyrusimap.org/cyrus-imapd/tree/imap/http_jmap.c?h...

Totally a stub right now, but yes - we would like to have it directly in Cyrus...

from the article itself:

"Finally, we know IMAP, SMTP and the DAVs aren’t going away any time soon. No protocol will succeed unless it provides an upgrade path from where we are now, and a compelling reason to switch. We will provide a proxy which can talk to existing servers and present them over JMAP."

Your comment implies that the quote you provided answered my question. It didn't.