2.1   Preferences (prefs.php)

The 'delhide_trash' preference has been added.

3.1   Preferences (prefs.php)

The 'delete_mark_seen' preference has been added.

4.1   Preferences (prefs.php)

The 'reply_lang' preference has been added.

5.1   MIME Viewer Options (mime_drivers.php)

The 'allthumbs' option has been removed from the HTML driver. Image thumbnail previews are now always shown if an image conversion utility is present on the system.

6.1   Configuration Options (conf.php)

The 'allow_resume_all' option has been removed. Only messages specifically marked as drafts can be resumed; however, all messages are given the option to "Edit As New".

7.1   HTML GUI editor

IMP only supports the CKeditor javascript HTML rich text editor. Xinha is no longer supported.

Button configuration is now stored in the prefs value 'ckeditor_buttons'.

7.2   Server Options (backends.php; OLD servers.php)

The format of servers.php has changed and has been renamed to backends.php.

The 'realm' option has been removed. Altering usernames at runtime should instead by accomplished by using Horde's 'authusername' and/or IMP's 'preauthenticate' hooks.

7.3   Configuration Options (conf.php)

Configuration relating to displaying the terms of agreement, GnuPG, OpenSSL, spellchecking, and login redirection have been moved to Horde.

The 'show_preview' option has been removed; enabling previews is now handled by the 'show_preview' preference.

The 'allow_resume_all_in_drafts' option has been removed; all messages that appear in the configured Drafts mailbox are now always allowed to be resumed.

The 'css_files' configuration option for the dynamic (dimp) display has been removed. Equivalent behavior can now be found in the Horde-wide 'cssfiles' hook.

The 'max_from_chars' and 'max_subj_chars' configuration options for the minimal (mimp) display have been removed.

The following configuration options have been removed:

allow_receipts
append_trailer
cache_folders
limit_factor
prepend_header
show_account_colors
size_limit
sort_limit

7.4   Preferences (prefs.php)

The 'sending_charset' and 'time_format' preferences have been moved to Horde.

The following preferences are no longer used and may be safely removed from your preference backend:

attachment_display
auto_delete_drafts
delete_attachments_monthly
delete_sentmail_monthly
dimp_login_view
disposition_request_read
disposition_send_mdn
fckeditor_buttons
fetchmail_link
fetchmail_menu
filter_on_sidebar
forward_bodytext
image_addrbook
image_replacement
nav_audio
nav_expanded_sidebar
nav_popup
purge_sentmail
purge_spam
purge_trash
use_vinbox
use_vtrash
vinbox_id
vtrash_id

7.5   Hooks (hooks.php)

The format of hooks.php has changed. See horde/docs/UPGRADING for more information.

The 'vinfo' hook has been removed. Use Horde's 'authusername' and/or IMP's 'preauthenticate' hooks instead.

The 'msglist_format' hook has been removed. X-Priority header handling is now handled in the core IMP code. Attachment icon display is now handled by the 'atc_flag' preference. The 'msglist_flags' hook is now used to dynamically set flags on messages.

7.6   Custom Message Headers (OLD header.php)

The header.php configuration file has been removed. Setting custom headers is now done in the 'pre_sent' hook.

7.7   Custom Message Trailers (OLD trailer.txt)

The trailer.txt file has been removed. Setting message trailers is now done in the 'trailer' hook.

7.8   Fetchmail

All code relating to fetchmail has been removed.

7.9   Flags

The list of available IMAP Flags/Keywords is now configurable via the 'msgflags' preference.

The Answered, Deleted, and Draft IMAP flags are no longer user settable by default - these flags have special meanings and are automatically handled by the various message action functions instead.

7.10   Menu

The dynamic view (DIMP) no longer supports the 'action' parameter located in config/menu.php.

7.11   Portal

Portal rendering has been moved to Horde - config/portal.php is no longer needed or used.

8.1   SQL Backend

An SQL table has been added that can be used to track sent messages. This is necessary to provide users with the "favourite recipients" address book, and for message rate throttling.

Execute the provided SQL script to add the table to your database, e.g.:

mysql --user=root --password=<MySQL-root-password> <db name> < scripts/sql/imp.sql

8.2   Unified IMAP Quota Driver

Separate quota drivers for Cyrus and Courier servers are no longer necessary. These drivers have been replaced by a generic IMAP driver that should also be suitable for other IMAP servers that support the QUOTA extension. Update config/servers.php and change the 'quota' => 'driver' setting to 'imap'.

8.3   Application Hooks

All hooks that are specific to IMP have been moved from the horde/config/hooks.php file. Move your existing IMP Hooks from there to imp/config/hooks.php.

8.4   User-Defined Mailbox Icons

The usage of the hook _imp_hook_mbox_icons() has changed. If you use this hook, make sure you change your implementation so it returns the correct value.

8.5   Changed Preferences

The default values for the folder preferences 'sent_mail_folder', 'drafts_folder', and 'trash_folder' have been changed and localized. Use the old values to prohibit the creation of duplicate folders for users that didn't explicitly set the folders in their preferences.

The following preferences are no longer used and may be safely removed from your config/prefs.php file and your preferences backend:

'auto_expand'
'num_words'

The 'mail_hdr' preferences has been moved from the identities to a regular preference. Existing user preferences are no longer used and have to be re-created by the users.

8.6   New Message List Format Hook

The new hook _imp_hook_msglist_format() has been added which allows the formatting of a message entry in the mailbox message list to be altered at the time the list is created. This hook has made the following configuration options obsolete:

$conf['mailbox']['show_attachments']
$conf['mailbox']['show_xpriority']

If you wish to continue using the functionality previously provided by these options, you should activate the msglist_format hook in config/conf.php. The sample hook contained in config/hooks.php contains the code necessary to replicate the previous behavior.

8.7   Spell Checking

The pspell driver is no longer supported since it does not work with HTML messages. If using pspell, you must upgrade to aspell version 0.60+.

8.8   Javascript HTML Editor

Support has been added for FCKeditor as an option for the javascript HTML editor available on the compose page. You must have Horde 3.2 or later installed to use this editor.

9.1   Automatic Namespace Detection

The namespace, hierarchies, folders, delimiter, and dotfiles parameters were removed from config/servers.php. Namespaces are now automatically configured pursuant to RFC 2342.

If using the UW IMAP daemon, you may notice a bunch of additional namespaces that were not displayed before as well as the ability of the user to view all files that live in their home directory via the folders screen. Information on how to correct your IMAP server configuration can be found at

http://wiki.horde.org/ImpUWIMAPNamespaces

9.2   User-Defined Headers

The config/headers.txt file has been removed and replaced by config/headers.php. Any user-defined headers should be migrated to this file. The new file has the advantage of allowing any valid PHP expression to be executed at run-time when generating the headers. See the top of the headers.php file for the new format required.

9.3   Removed Preferences

The following preferences are no longer used and may be safely removed from your config/prefs.php file and your preferences backend:

'disposition_request_delivery'
'wrap_width'

9.4   Virtual Folders

The format for saved Virtual Folders has changed. To convert to the new format you must run the script located at scripts/upgrades/convert_vfolders.php.