---
type: source
title: Groupware Synchronization with Android
tags: [android, groupware, synchronization, caldav, carddav]
related: ["davx5", "jtx-board", "groupware", "android", "caldav", "carddav"]
created: 2026-07-01
updated: 2026-07-01
sources: ["output/rz_uni_greifswald_de_dienste_webdienste_groupware_sync_android.md"]
---

# Groupware Synchronization with Android

This source provides technical instructions for synchronizing calendars and contacts from the Universität Greifswald Groupware service to Android devices.

## Core Technical Requirements
Because Android does not natively support the necessary synchronization protocols, the URZ recommends using third-party applications.

### Calendar and Contact Synchronization
- **Protocols**: [[caldav]] (Calendars) and [[carddav]] (Contacts).
- **Primary Tool**: [[davx5]] is the recommended bridge for synchronization.
- **App Availability**: Available as a paid app in the Google Play Store or as a free version via [[f-droid]].

#### Configuration Parameters
To set up the synchronization in DAVx5, the following settings are required:
- **Base URL**: `https://groupware.uni-greifswald.de`
- **Username/Authentication**: Central URZ user ID / [[zentraler-nutzeraccount]] credentials.
- **Password**: Associated account password.
- **Critical Setting**: **Preemptive Authentication** must be **disabled** (unchecked).
- **Account Name**: Must be set to the user's **primary email address** to ensure the correct organizer is attributed to appointments within Groupware.

### Task Management
Synchronizing "To-Do" lists requires an additional application beyond DAVx5.
- **Recommended App**: [[jtx-board]] (developed in cooperation with DAVx5; the free version is functional).
- **Alternative Apps**:
    - **Tasks.org**: Noted as not working in the free version (free version limited).
    - **OpenTasks**: Deprecated and no longer developed.

## Support
Technical issues are handled by the [[universitatsrechenzentrum-urz]] via the [[groupware]] ticket system or the URZ hotline (ext. 1420).