Hi,

after more than one year of intensive development, we just released Z-Push 2.3.0 alpha2 (tag 2.3.0alpha2, commit 595d6f2394cd81040f20d8aaf93a7c45e4ed7b7b).
There are many new features, like Z-Push packages and repositories, MySQL and memcache support for states, improved Outlook compatibility (KOE) and especially: a vast speed improvement!
We would like to thank a lot our community contributors Etienne, Francisco, Nicolas, Ralf and Vincent who helped to make this possible!

*Upgrade procedure*
You can directly upgrade from any Z-Push 2.2.x. 
*After the upgrade, "z-push-admin -a fixstates" needs to be executed once!
 Else the Ping request will not block and devices will sync continuously.
After the fixstates all mobiles will work normally and Ping will be blocking as expected.

*This version introduces new features that are partially not downgradable*
A limited downgrade is possible.
In order to use all new features (especially for Outlook users) existing profiles must be completely re-synchronized, e.g. via "z-push-admin -a resync -u username".
After the resync the devices use a new type of folderids (short ids) which are not compatible with Z-Push 2.2.x anymore.
Re-synchronized profiles or newly connected devices (after the upgrade to 2.3.0) will not work properly when downgrading to Z-Push 2.2.x. These devices will be re-synchronized again automatically.
There is no need to perform the resync immediately. Profiles created with 2.2.x will work normally with 2.3.0, but not all new features will be available.

*Blackberry 10 users+: our tests have shown that a server side resync as described here is not enough for BB10 devices to work reliably. You need to remove and re-create the profile on these devices. 
BB seems to cache old folderids which causes sync inconsistencies. Ideally: (1) remove profile from BB (2) remove state on server (3) create the profile on the BB again. 
Existing Blackberry profiles will work normally with 2.3.0, but at some point they should be re-synchronized & re-created.

The Z-Push tarball is available, but we encourage you to use the Z-Push repositories and packages.
More information about the installation from repositories and packages is available here: https://wiki.z-hub.io/display/ZP/Installation

*New Features*
https://jira.z-hub.io/browse/ZP-230]ZP-230 - SQL state machine
https://jira.z-hub.io/browse/ZP-556]ZP-556 - Share folders read/only
https://jira.z-hub.io/browse/ZP-77]ZP-77   - Systemwide policy configuration
https://jira.z-hub.io/browse/ZP-402]ZP-402 - Implement Free/Busy support
https://jira.z-hub.io/browse/ZP-622]ZP-622 - Ping should notify on hierarchy changes
https://jira.z-hub.io/browse/ZP-767]ZP-767 - Open Shared Folders API (Webservice)
https://jira.z-hub.io/browse/ZP-696]ZP-696 - Z-Push packages
https://jira.z-hub.io/browse/ZP-900]ZP-900 - Kopano Outlook Extension compatibility
https://jira.z-hub.io/browse/ZP-560]ZP-560 - Logging to syslog
https://jira.z-hub.io/browse/ZP-665]ZP-665 - New backend - LDAP
https://jira.z-hub.io/browse/ZP-684]ZP-684 - New backend - CardDAV
https://jira.z-hub.io/browse/ZP-685]ZP-685 - New backend - CalDAV
https://jira.z-hub.io/browse/ZP-739]ZP-739 - Heartbeat interval range lifetime
https://jira.z-hub.io/browse/ZP-837]ZP-837 - Have a serverside timeout depending on device type
https://jira.z-hub.io/browse/ZP-849]ZP-849 - Implement shorter folder ids (was integer)
https://jira.z-hub.io/browse/ZP-691]ZP-691 - Remove legacy stuff
https://jira.z-hub.io/browse/ZP-698]ZP-698 - IPC provider logic
https://jira.z-hub.io/browse/ZP-828]ZP-828 - IMAP - contributions
https://jira.z-hub.io/browse/ZP-797]ZP-797 - rework WBXML handling
https://jira.z-hub.io/browse/ZP-705]ZP-705 - Implement support for STREAMER_TYPE_STREAM_ASPLAIN

*Improvements*
https://jira.z-hub.io/browse/ZP-594]ZP-594 - Failsave for endless loops
https://jira.z-hub.io/browse/ZP-648]ZP-648 - Implement ResolveRecipients for FreeBusy
https://jira.z-hub.io/browse/ZP-666]ZP-666 - z_RFC882 - Update version
https://jira.z-hub.io/browse/ZP-668]ZP-668 - mimeDecode.php - Update version and changes
https://jira.z-hub.io/browse/ZP-681]ZP-681 - Remove closing PHP tags
https://jira.z-hub.io/browse/ZP-682]ZP-682 - Composer - Auto-Include
https://jira.z-hub.io/browse/ZP-700]ZP-700 - Catch PHP fatals and log them into z-push-error.log
https://jira.z-hub.io/browse/ZP-760]ZP-760 - Always log generic exception as fatal error
https://jira.z-hub.io/browse/ZP-765]ZP-765 - ZLog/Syslog refactor
https://jira.z-hub.io/browse/ZP-818]ZP-818 - Send no answer collection for unchanged folders in Sync
https://jira.z-hub.io/browse/ZP-832]ZP-832 - Detect folder changes faster
https://jira.z-hub.io/browse/ZP-834]ZP-834 - Remove SINK_FORCERECHECK
https://jira.z-hub.io/browse/ZP-838]ZP-838 - Set MAX_ITEMS to 512 to accelerate Outlook sync
https://jira.z-hub.io/browse/ZP-839]ZP-839 - Z-Push-top writes over several lines when Outlook synchronizes
https://jira.z-hub.io/browse/ZP-853]ZP-853 - Backend could not support FolderStats for single folders
https://jira.z-hub.io/browse/ZP-865]ZP-865 - Don't enter conflict detection if more than 100 items are queued
https://jira.z-hub.io/browse/ZP-886]ZP-886 - IImportChanges->ImportMessageDeletion() should support soft deletions
https://jira.z-hub.io/browse/ZP-919]ZP-919 - KOE: GAB appears wrong in z-push-top PING
https://jira.z-hub.io/browse/ZP-929]ZP-929 - KOE: make syncgab script executable directly

*Bug fixes*
https://jira.z-hub.io/browse/ZP-711]ZP-711 - zpush_fatal_handler reports PHP Notice & Warning as FATAL in z-push(-error).log
https://jira.z-hub.io/browse/ZP-802]ZP-802 - Fix default Settings() response in abstract Backend class
https://jira.z-hub.io/browse/ZP-810]ZP-810 - Missing configuration in BackendCombined for BackendLDAP
https://jira.z-hub.io/browse/ZP-825]ZP-825 - Composer: replacenullchar filter can not be found
https://jira.z-hub.io/browse/ZP-829]ZP-829 - CardDAV - fix phone number mappings
https://jira.z-hub.io/browse/ZP-841]ZP-841 - SyncKey "0" needs to invalidate FolderStat
https://jira.z-hub.io/browse/ZP-843]ZP-843 - MAPI stream warnings
https://jira.z-hub.io/browse/ZP-848]ZP-848 - FolderStat should not be considered if not using latest SyncKey
https://jira.z-hub.io/browse/ZP-851]ZP-851 - FolderStat needs expiration time
https://jira.z-hub.io/browse/ZP-855]ZP-855 - Searched and found message can not be deleted (iOS)
https://jira.z-hub.io/browse/ZP-856]ZP-856 - Code still contains while(1) in command processors
https://jira.z-hub.io/browse/ZP-866]ZP-866 - After exporting a change states used for empty request may be wrong
https://jira.z-hub.io/browse/ZP-871]ZP-871 - Integer folderids may falsly trigger hierarchy sync in Ping
https://jira.z-hub.io/browse/ZP-872]ZP-872 - Ping doesn't catch all notifications
https://jira.z-hub.io/browse/ZP-874]ZP-874 - WBXMLencoder processMultipart() should warn if stream has "no size"
https://jira.z-hub.io/browse/ZP-876]ZP-876 - Arrays in constants is not supported in php 5.4
https://jira.z-hub.io/browse/ZP-877]ZP-877 - Sync period change not honoured
https://jira.z-hub.io/browse/ZP-879]ZP-879 - Fix for ZP-779 doesn't work when working on shared folders
https://jira.z-hub.io/browse/ZP-882]ZP-882 - Loading policies.ini doesn't work from CLI
https://jira.z-hub.io/browse/ZP-887]ZP-887 - Z-Push: warning when looking up free/busy for a new user
https://jira.z-hub.io/browse/ZP-895]ZP-895 - Integer ids can trigger folder name switches by Outlook
https://jira.z-hub.io/browse/ZP-896]ZP-896 - Warnings in MAPIProvider
https://jira.z-hub.io/browse/ZP-904]ZP-904 - Autodiscover is not syslog compatible
https://jira.z-hub.io/browse/ZP-905]ZP-905 - KopanoChangesWrapper throws fatal with php lower than 5.5
https://jira.z-hub.io/browse/ZP-918]ZP-918 - KOE: GAB folder being added when it doesn't exist
https://jira.z-hub.io/browse/ZP-920]ZP-920 - Setting of reply flag is broken
https://jira.z-hub.io/browse/ZP-921]ZP-921 - Move causes duplicates in destination folder
https://jira.z-hub.io/browse/ZP-922]ZP-922 - Subfolders don't show up in the synchronized folder list
https://jira.z-hub.io/browse/ZP-923]ZP-923 - Ping fails to load state for zero sync keys
https://jira.z-hub.io/browse/ZP-924]ZP-924 - KOE: gab-sync calls wrong mapi error function
https://jira.z-hub.io/browse/ZP-927]ZP-927 - When setting up additionalLogUsers the last stats line is not logged
https://jira.z-hub.io/browse/ZP-930]ZP-930 - z-push-top doesn't work in another directory with memcache enabled

*Others*
https://jira.z-hub.io/browse/ZP-206]ZP-206 - Default log rotation for z-push packages
https://jira.z-hub.io/browse/ZP-649]ZP-649 - Fix ResolveRecipients for Zarafa
https://jira.z-hub.io/browse/ZP-650]ZP-650 - Implement ResolveRecipients for IMAP
https://jira.z-hub.io/browse/ZP-674]ZP-674 - Remove the include of mimeDecode.php in Zarafa backend
https://jira.z-hub.io/browse/ZP-706]ZP-706 - Update SyncObjects
https://jira.z-hub.io/browse/ZP-707]ZP-707 - Implement plain streams for Zarafa
https://jira.z-hub.io/browse/ZP-708]ZP-708 - Implement plain streams for IMAP
https://jira.z-hub.io/browse/ZP-709]ZP-709 - Implement plain streams for Zimbra
https://jira.z-hub.io/browse/ZP-710]ZP-710 - Implement plain streams for Egroupware
https://jira.z-hub.io/browse/ZP-714]ZP-714 - Implement Free/Busy lookup for Zarafa backend
https://jira.z-hub.io/browse/ZP-716]ZP-716 - [Zarafa] Implement options processing for ResolveRecipients
https://jira.z-hub.io/browse/ZP-718]ZP-718 - Re-factor resolving recipients in gal and contacts
https://jira.z-hub.io/browse/ZP-737]ZP-737 - ResolveRecipients Availability and Picture do not honour AS version
https://jira.z-hub.io/browse/ZP-741]ZP-741 - Loopdetection does not need the folder type
https://jira.z-hub.io/browse/ZP-768]ZP-768 - Additional folder data in device + Set/Get/List/Remove APIs
https://jira.z-hub.io/browse/ZP-769]ZP-769 - Integration into FolderSync + FolderChange operations
https://jira.z-hub.io/browse/ZP-770]ZP-770 - Expose API via Webservice
https://jira.z-hub.io/browse/ZP-771]ZP-771 - Changes in Additional User Folder API should trigger a FolderSync while in Ping
https://jira.z-hub.io/browse/ZP-772]ZP-772 - Change default value of USE_FULLEMAIL_FOR_LOGIN
https://jira.z-hub.io/browse/ZP-774]ZP-774 - Webservice documentation
https://jira.z-hub.io/browse/ZP-777]ZP-777 - Catch & Filter hierarchy events
https://jira.z-hub.io/browse/ZP-778]ZP-778 - Verify hierarchy notifications
https://jira.z-hub.io/browse/ZP-779]ZP-779 - Outlook: message is suddenly unread after moving it to another folder
https://jira.z-hub.io/browse/ZP-816]ZP-816 - z-push-admin and z-push-top missing log dependency
https://jira.z-hub.io/browse/ZP-821]ZP-821 - Integrate autoloading for backends
https://jira.z-hub.io/browse/ZP-846]ZP-846 - z-push-admin fix-states need to fix missing folderdata of hierarchy state
https://jira.z-hub.io/browse/ZP-847]ZP-847 - Remove stream seek() call from WBXMLencoder
https://jira.z-hub.io/browse/ZP-852]ZP-852 - Show user's policy in z-push-admin
https://jira.z-hub.io/browse/ZP-858]ZP-858 - Ping hierarchy checks old states
https://jira.z-hub.io/browse/ZP-881]ZP-881 - Change ZCP server location for listfolders
https://jira.z-hub.io/browse/ZP-897]ZP-897 - Rename ZCP backend
https://jira.z-hub.io/browse/ZP-901]ZP-901 - ReplyBack of read flag should be done right
https://jira.z-hub.io/browse/ZP-902]ZP-902 - ZPushAdmin->AdditionalFolderList() should list types and readonly flag
https://jira.z-hub.io/browse/ZP-917]ZP-917 - Remove default IPC_PROVIDER
https://jira.z-hub.io/browse/ZP-914]ZP-914 - KOE: Hide Z-Push-KOE-GAB folder automatically on creation
https://jira.z-hub.io/browse/ZP-928]ZP-928 - Put apache configuration files in GIT

You can download the Z-Push 2.3.0 alpha2 tarball here: http://download.z-push.org/beta/2.3/
Or try the Z-Push respositories: https://wiki.z-hub.io/display/ZP/Installation

Please share your experiences and give feedback!

Greetings,
Sebastian
Z-Push dev team