---
type: source
title: Groupware Synchronization Guide
tags: [groupware, synchronization, dav, urz, caldav, carddav]
related: [groupware, dav-synchronisation]
created: 2026-07-01
updated: 2026-07-01
sources: ["output/rz_uni_greifswald_de_dienste_webdienste_groupware_sync.md"]
---

# Groupware Synchronization Guide

This source provides technical instructions on synchronizing data from the central Groupware system of the Universität Greifswald with external clients.

## Key Synchronization Details
- **Synchronizable Data**: Calendar entries, address book entries, and task lists.
- **Temporal Limit**: CalDAV synchronization includes all future appointments and those up to 12 months in the past.

## Technical Implementation
The system utilizes the **DAV protocol** family for synchronization:
- **CalDAV**: Used for calendar and task data.
- **CardDAV**: Used for address book data.

## Configuration Requirements
- **Resource Visibility**: Resources (calendars, address books) must be explicitly enabled in the Groupware account settings under **"My Account" $\rightarrow$ "Synchronization"** to be visible to external clients.
- **Task Management**: Task lists are linked to calendars and must be managed via calendar administration.

## Platform-Specific Notes
- **Android**: Due to a software bug/error in the Android OS, users must explicitly enable the setting **"Allow deletion via synchronization"** (Löschen über Synchronisation erlauben) in the Groupware account settings to allow items deleted on the client to be removed from the server.

## Supported Clients
The guide provides detailed instructions for the following platforms:
- **Operating Systems**: Android, iOS, macOS.
- **Email Clients**: Mozilla Thunderbird, Microsoft Outlook.