Quoting Ed W <li...@wildgooses.com>:

Hi

And FWIW, that RFC is classified as Experimental.  Hasn't been a bunch
of momentum behind it, at least in terms of adoption/implementations.
Mailbox metadata seems to be the more interesting development at this
time (RFC 5464).

michael

Yes, I know, but for groupware collaboration on mails, it is an useful
feature. Especially in companies, where an extreme group based workflow
is used.

Is this the extension necessary to make Kolab work correctly?

IIRC, No.  Kolab uses the mailbox-level METADATA extension instead (RFC 5464).

michael

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