[Dovecot] Does either version 1.2 or 1.4 support UIDPLUS?

My ISP currently runs version 1.2 and I'm looking to make use of
UIDPLUS because I want to append and then move the message I've just
appended to another folder so then I need the UID in order to address
the new message.

My ISP says they have plans to upgrade to version 1.4 soon.

Do either of these versions support UIDPLUS? ie. give me the new UID
as the response to an append?