IMAP Extensions for Conditional STORE Operation or Quick Flag Changes Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization (QRESYNC)
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Network Working Group A. Melnikov
Internet-Draft Isode Ltd
Obsoletes: 4551, 5162 (if approved) D. Cridland
Updates: 4315, 3501, 2683 (if approved) Arcode Inc
Intended status: Standards Track January 7, 2014
Expires: July 11, 2014
IMAP Extensions for Conditional STORE Operation or Quick Flag Changes
Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization
Often, multiple IMAP (RFC 3501) clients need to coordinate changes to
a common IMAP mailbox. Examples include different clients working on
behalf of the same user, and multiple users accessing shared
mailboxes. These clients need a mechanism to efficiently synchronize
state changes for messages within the mailbox.
Initially defined in RFC 4551, The Conditional Store facility
provides a protected update mechanism for message state information
and a mechanism for requesting only changes to message state. This
memo updates that mechanism and obsoletes RFC 4551, based on
This document additionally updates another IMAP extension, Quick
Resynchronization, which builds on the Conditional Store extension to
provide an IMAP client the ability to fully resynchronize a mailbox
as part of the SELECT/EXAMINE command, without the need for
additional server-side state or client round-trips. Hence this memo
obsoletes RFC 5162.
Finally, when these extensions are used, other mechanisms are
updated. In particular, the line length recommendation in RFC 2863
is modified, the UID EXPUNGE command from RFC 4315 is modified, and
the behavior of STORE/UID STORE/FETCH/UID FETCH/EXPUNGE commands from
RFC 3501 is modified.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
Melnikov & Cridland Expires July 11, 2014 [Page 1]
Internet-Draft IMAP CONDSTORE & QRESYNC January 2014
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 11, 2014.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Notation . . . . . . . . . . . . . . . . . . . . 4
3. IMAP Protocol Changes . . . . . . . . . . . . . . . . . . . . 5
3.1. CONDSTORE extension . . . . . . . . . . . . . . . . . . . 5
3.1.1. Advertising support for CONDSTORE . . . . . . . . . . 8
3.1.2. New OK Untagged Responses for SELECT and EXAMINE . . 8
3.1.3. STORE and UID STORE Commands . . . . . . . . . . . . 10
3.1.4. FETCH and UID FETCH Commands . . . . . . . . . . . . 16
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