After being moved, messages remain in both folders on the server

[Adam Tauno Williams]

Quoting Eric Luyten <Eric.Luyten at vub.ac.be>:
> On Tue, April 3, 2012 6:05 pm, Mikhail T. wrote:
>> On 03.04.2012 12:01, info-cyrus-request at lists.andrew.cmu.edu wrote:
>>> All links are contained within one user's mailbox hierarchy.
>>> Must be incomplete COPY operations, as Bron suggested.
>> I always use Thunderbird's "Move" option -- never "Copy"... Yours,
> Thunderbird may have a 'Move' option but the IMAP protocol does not.
> 'Moving' a message translates to a COPY followed by an EXPUNGE.

True; but if the server supports UIDPLUS (allowing individual messages  
to be expunged) vs. expunging the entire folder (or not expunging at  
all) - and - the client supports that extensions... then "move"  
behaves more consistently.  I have no idea if TB supports / uses  
UIDPLUS per-message-expunge.