Log Message:
The major changes compared to IMP version H3 (4.3.3) are:
    * Don't cache local PGP public keys retrieved from the address book.
    * Fixed some URL escaping issue for certain links introduced with the
      security fixes from 4.3.3.
    * Fixed updating POP3 indices when deleting in mailbox view.
    * Fixed some folder creation issues occasionally seen, most often during
      maintenance tasks.
    * Other minor bugfixes.

The full list of changes (from version H3 (4.3.3)) can be viewed here:

http://cvs.horde.org/diff.php/imp/docs/CHANGES?r1=1.699.2.376&r2=1.699.2.389&ty=h