+ Backward Compatibility Breaking Horde Issues (aka Horde 4.0 TODO)
* Fix cloning behavior (See Bug 1410).
* Remove deprecated code in IMAP_Tree::.
* Move IMP_IMAPClient:: to Horde.
* Merge IMP_Thread:: to IMAP_Thread::.
* Encrypt deprecations in Horde_Crypt_pgp::.
* Use one place for clear text sendmail error messages.
* rename files in imp/templates/prefs to more sensible defaults (e.g. draftsfolderselect.inc, not folderselect.inc)
* Remove deprecated code in MIME_Headers::
* Remove {{$foo = &new Foo();}} calls and replace with {{$foo = new Foo();}} - The former is deprecated as of PHP 5 and causes errors when strict code checking is on.
* Remove IMP_Template::.
* Remove app-specific 'stripe.js' files.
* Move share edit form into framework package to make it extendable.
* Convert all configuration files to XML format.
* Replace horde's popup.js with IMP's version.
* Remove IMP_IMAP_Search:: and Ingo_IMAP_Search::.
* Remove imap_reopen() call in IMAP_Search::.
* Make getType() return values consistent in iCalendar::.
* Move date/time parsing methods from iCalendar:: to Horde_Date::.