Does this fix not contradict to what is said in comment #7 
http://bugs.horde.org/ticket/12217#c7 ?

Changes have been made in Git (master):

commit 1ea5f501bdb4fa4e514294a348520764e6fc90a3
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Wed Jul 24 16:16:57 2013 -0600

     No need to output mailbox in UTF7-IMAP format in HTML (Bug #12217)

  ingo/lib/Ingo.php |    4 ++--
  1 files changed, 2 insertions(+), 2 deletions(-)

http://git.horde.org/horde-git/-/commit/1ea5f501bdb4fa4e514294a348520764e6fc90a3

I don't see this.  When creating a new folder in ingo, it creates the 
folder using the CORRECT 2nd string (the first string is incorrect.):

C: 4 CREATE Kir&AOE-ly L&AOE-szl&APM-
S: 4 OK Create completed.

And it creates the correct filter.

I can verify that *subsequently* editing that rule and saving could 
cause problems.  But that's not what you said you did here (and this 
has been fixed).

This bug isn't resolved.
I created a new ingo rule to move mails to "Király László" folder.
It's been created in ingo. After a test mail I got 2 different folders:

Kir&-AOE-ly L&-AOE-szl&-APM-
and
Kir&AOE-ly L&AOE-szl&APM-

The first created by the "Create new folder" function in ingo, and the 
second by the filter what I created.

Imp shows the first good and the second like here.

As you can see there's a difference beetween the encoding of the 
accents (the "-" char).

The problem remains in Ingo 3.1.1. The problem is very simple - when 
adding new rule, which uses not (yet) existing folder, the folder name 
is not encoded in utf7imap.

e.g. I want to add new rule, which move emails to folder "ab?". I've 
found this in html after entering new mailbox name.
<input id="actionvalue_new" name="actionvalue_new" type="hidden" value="ab?">
but it should be:
<input id="actionvalue_new" name="actionvalue_new" type="hidden" 
value="ab&AQ0-">

All existing mailboxes, listed in the dropdown (id="actionvalue"), are 
encoded in utf7imap.

So imho there is two options here:
1. Encode mailbox name with javascript right before setting it to 
actionvalue_new field.
2. Before saving rule, check weather the mailbox exists. If it 
doesn't, convert mailbox name from utf8 to utf7imap before performing 
any action further.

No.  IMAP mailbox names are stored internally in Ingo as UTF7-IMAP (a 
historical relic).  So this would totally break things.

If you have pre-existing mailboxes in filters you created before this 
fix, you will have to delete those mailboxes.

Hi,

this patch didn't help, but this did. Please take a look at diff 
attached and verify weather it should be in that way.

Ingo 3.0.4.

Changes have been made in Git (master):

commit fbbbd00d17a0bcfefacd41f6f2ef10869de1f679
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Mon Apr 29 01:01:53 2013 -0600

     [mms] Fix copy/move actions when destination mailbox contains non 
ASCII characters (Bug #12217).

     Conflicts:
             ingo/lib/Script/Imap.php
             ingo/package.xml

  ingo/docs/CHANGES        |    2 ++
  ingo/lib/Script/Imap.php |   17 ++++++++++-------
  ingo/package.xml         |    1 +
  3 files changed, 13 insertions(+), 7 deletions(-)

http://git.horde.org/horde-git/-/commit/fbbbd00d17a0bcfefacd41f6f2ef10869de1f679

Changes have been made in Git (FRAMEWORK_5_0):

commit 39ac08882673ddbd3251abc248af3e8795f6ece3
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Mon Apr 29 01:01:53 2013 -0600

     [mms] Fix copy/move actions when destination mailbox contains non 
ASCII characters (Bug #12217).

  ingo/docs/CHANGES        |    2 ++
  ingo/lib/Script/Imap.php |   17 ++++++++++-------
  ingo/package.xml         |    2 ++
  3 files changed, 14 insertions(+), 7 deletions(-)

http://git.horde.org/horde-git/-/commit/39ac08882673ddbd3251abc248af3e8795f6ece3

Attached picture with folder names.

If folder name has Lithuanian letters (?????????), and it is chosen in 
filter to move to that folder, then another folder is created and 
messages are moved to new one. For example folder name is test?, and 
when filter rule works, it creates folder named test&AWE-