Release Date: April 11, 2009

# 3rd libraries added
  - CodeIgniter CI_Input: as an alternative for faster xss cleaner

# Added mobile version for Staff (e.g: www.yourdomain.com/support/staff/m/)
# Added Toggle HTML Editor and Plain Text Editor in Staff/Submit Ticket
# Added user last message in email dispatched to users when staff reply the tickets.
# Alternative xss cleaner for better performance.
# Retrieve emails can now have a limited number for every retrieval, so it won't take a long time (get expire time) if you have large amount of emails.

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Update:
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1. No Database update from 2.3.1.5
2. Updated files:
    - All php core files are udpated (including front and staff php files)
    - Added classes/zero/factory.php
    - Added classes/zero/input.php
    - Added classes/zero/zero_mobile.inc.php
    - Added staff/m/*.php
    - Added gui/smarty_template/templates/staff/m/*.tpl
    - No front templates updated

Just in case: Please backup your old files before you replace them with the new ones, especially config.php