A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Internet Message Access Protocol Extension Working Group of the IETF.
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. They must be able to guarantee that only one client can change message state (e.g., message flags or annotations) at any time. An example of such an application is use of an IMAP mailbox as a message queue with multiple dequeueing clients.
The Conditional Store facility provides a protected update mechanism for message state information that can detect and resolve conflicts between multiple writing mail clients.
This document defines an extension to IMAP (RFC 3501).
http://www.ietf.org/internet-drafts/draft-ietf-imapext-condstore-05.txt