These are the the packages from the SOGo project (www.sogo.nu).

SOGo provides native Microsoft ActiveSync support. Mobile devices
such as Apple iPhone, Android, Windows Phone, and BlackBerry 10 can
fully synchronize emails, contacts, events and tasks with SOGo.

SOGo offers native Microsoft Outlook compatibility using the
OpenChange [External] backend developed by Inverse [External].
This means Microsoft Outlook 2003, 2007, 2010 and 2013 can talk
directly to SOGo — just like if it was a Microsoft Exchange server.
No plugins are required in Outlook to make this work.

The following apache modules have to be enabled: mod_version, mod_proxy mod_proxy_http mod_headers

Install SOGo (Version 2) or SOGo3. Both Versions cannot work on one host.
It is however possible to intall SOGo3 on another host connected to the same database aus SOGo v2.