IMP 6.1.0beta3.

Changes have been made in Git (master):

commit 9aa040053c47a7c2e3b7427e01b580eaa7fe9cb3
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Thu May 16 13:11:14 2013 -0600

     [mms] Fix regression in renaming mailboxes (Bug #12260).

  imp/docs/CHANGES                             |    1 +
  imp/lib/Ajax/Application/Handler/Dynamic.php |    2 +-
  imp/lib/Mailbox.php                          |   12 +++++++++---
  imp/package.xml                              |    4 ++--
  4 files changed, 13 insertions(+), 6 deletions(-)

http://git.horde.org/horde-git/-/commit/9aa040053c47a7c2e3b7427e01b580eaa7fe9cb3

Attempting to rename a mailbox from the dynamic interface called 
"base" to "testbase" fails with:

"Renaming base to base/testbase failed. The object couldn't be created 
because it already exists."

The base/testbase looks wonky to me.

Log:
------------------------------
S: * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID 
ENABLE IDLE STARTTLS LOGINDISABLED] Dovecot ready.
C: 1 STARTTLS
S: 1 OK Begin TLS negotiation now.
C: 2 [LOGIN Command - username: jordyn]
S: 2 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID 
ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS 
MULTIAPPEND UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED 
I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN 
CONTEXT=SEARCH LIST-STATUS] Logged in
C: 3 ENABLE QRESYNC
C: 4 LIST () "" ("base/*")
S: * ENABLED QRESYNC
S: 3 OK Enabled.
S: * LIST () "/" "base/"
S: 4 OK List completed.
C: 5 LSUB "" "base"
S: * LSUB () "/" "base"
S: 5 OK Lsub completed.
C: 6 LIST () "" ("base/*")
S: * LIST () "/" "base/"
S: 6 OK List completed.
C: 7 LSUB "" "base/*"
S: 7 OK Lsub completed.
C: 8 RENAME "base" {14+}
C: [LITERAL DATA: 14 bytes]
C:
S: 8 NO [ALREADYEXISTS] Mailbox already exists: base
C: 9 LOGOUT
S: * BYE Logging out
S: 9 OK Logout completed.