IMAP Extensions for Conditional STORE Operation or Quick Flag Changes Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization (QRESYNC)
draft-ietf-qresync-rfc5162bis-06

The information below is for an old version of the document
Document Type Active Internet-Draft (qresync WG)
Last updated 2013-12-19
Replaces draft-melnikov-5162bis
Stream IETF
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Stream WG state In WG Last Call
Document shepherd Eliot Lear
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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
Intended status: Standards Track                       December 19, 2013
Expires: June 22, 2014

 IMAP Extensions for Conditional STORE Operation or Quick Flag Changes
   Resynchronization (CONDSTORE) and Quick Mailbox Resynchronization
                               (QRESYNC)
                  draft-ietf-qresync-rfc5162bis-06.txt

Abstract

   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 synchronize state
   changes for messages within the mailbox.  The Conditional Store
   facility allows a client to quickly resynchronize mailbox flag
   changes.

   The Conditional Store facility also provides a protected update
   mechanism for message state information that can detect and resolve
   conflicts between multiple writing mail clients.  For example, the
   mechanism can be used to guarantee that only one client can change
   message state at any time.

   This document additionally defines another IMAP extension, which
   gives an IMAP client the ability to quickly resynchronize any
   previously opened mailbox as part of the SELECT/EXAMINE command,
   without the need for server-side state or additional client round-
   trips.  That extension builds on top of the Conditional Store
   extension and covers message deletions in addition to flag changes.

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
   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

Melnikov & Cridland       Expires June 22, 2014                 [Page 1]
Internet-Draft          IMAP CONDSTORE & QRESYNC           December 2013

   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 June 22, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   5
   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
       3.1.5.  MODSEQ Search Criterion in SEARCH . . . . . . . . . .  19
       3.1.6.  Modified SEARCH Untagged Response . . . . . . . . . .  20
       3.1.7.  HIGHESTMODSEQ Status Data Items . . . . . . . . . . .  20
       3.1.8.  CONDSTORE Parameter to SELECT and EXAMINE . . . . . .  21
       3.1.9.  Interaction with IMAP SORT and THREAD extensions  . .  21
       3.1.10. Interaction with IMAP ESORT and ESEARCH extensions  .  22
       3.1.11. Additional Quality-of-Implementation Issues . . . . .  22
       3.1.12. CONDSTORE Server Implementation Considerations  . . .  23
     3.2.  QRESYNC extension . . . . . . . . . . . . . . . . . . . .  24
       3.2.1.  Advertising support for QRESYNC . . . . . . . . . . .  24
       3.2.2.  Use of ENABLE . . . . . . . . . . . . . . . . . . . .  24
       3.2.3.  Additional requirements on QRESYNC servers  . . . . .  25
       3.2.4.  QRESYNC Parameter to SELECT/EXAMINE . . . . . . . . .  25
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