Install z-push-backend-combined by entering the following commands in the terminal:
sudo apt update sudo apt install z-push-backend-combined
Description:
open source implementation of the ActiveSync protocol - combine backends
Z-Push is an implementation of the ActiveSync protocol which is used 'over-the-air' for multi platform ActiveSync devices, including Windows Mobile, iPhone, Sony Ericsson and Nokia mobile devices. With Z-Push any groupware can be connected and synced with these devices. . The combined backend allows you to use a combination from different other backends (imap, maildir, vcarddir, kopano) to sync data to mobile devices.
Homepage: http://z-push.org/download/
Version: 2.3.8-2ubuntu1
Section: universe/web