openDesk Community Edition (CE) is a sovereign office and collaboration suite, developed by the Center for Digital Sovereignty (ZenDiS). It offers a complete alternative to Microsoft 365 and Google Workspace with 12 integrated applications: Email, Calendar, Contacts, Chat, Video, Files, Documents, Projects, Wiki, Notes, Tasks, and Identity Management.

• Primary: Public administration (federal, state, municipal)
• Secondary: Companies with high compliance requirements
• Ideal for: Law firms, tax advisors, financial service providers, healthcare, engineering firms

openDesk is particularly suitable for organizations that:

• Process sensitive data
• Must ensure GDPR compliance
• Desire independence from US corporations
• Need long-term calculable IT costs

openDesk is developed by ZenDiS (Center for Digital Sovereignty of Public Administration GmbH) - a company of the Federal Ministry of the Interior. The components come from established open-source companies:

• Open-Xchange (Email)
• Nextcloud (Files)
• Element (Chat)
• Collabora (Documents)
• OpenProject (Projects)
• XWiki (Wiki)

Community Edition:

• Free (Open Source)
• No license costs
• Community support

TCO Calculator →

Community Edition:

• No license costs
• But: Own infrastructure + personnel required

Typically 20-40% cheaper over 3 years - depending on:

• User count
• Storage requirements
• Support requirements
• Existing infrastructure

Use our TCO Calculator for an individual estimate.

Yes, completely:

• Emails (IMAP sync)
• Files (OneDrive/SharePoint → Nextcloud)
• Calendars and contacts
• Documents (format conversion possible)

Yes:

• DOCX, XLSX, PPTX are fully supported
• Collabora can open and edit these formats
• Recommended: Migration to ODF (Open Document Format)

On-Premises: Yes

• Kubernetes cluster required
• Minimum 3 nodes for high availability
• Alternative: Managed Kubernetes (e.g., SCS)

On-Premises (Minimum):

• 3 servers (or VMs)
• 32 GB RAM, 8 vCPUs per node
• 2 TB+ storage
• Kubernetes (K8s, K3s, OpenShift)

Community Edition:

• Manual updates via Helmfile
• Community support for problems

Yes, through:

• Open Source (code auditable)
• No backdoors
• End-to-end encryption (chat, email)
• Regular security updates
• BSI reference architecture

Yes:

• Developed for German authorities
• Data protection by design
• Data processing agreement not required (for On-Premises)

On-Premises:

• On your own servers
• Complete control

With openDesk:

• No US companies involved
• No access by US authorities possible
• German/European legal basis

1. Email (Open-Xchange)
2. Calendar (OX Calendar)
3. Contacts (OX Contacts)
4. Chat (Element)
5. Video (Jitsi)
6. Files (Nextcloud)
7. Documents (Collabora)
8. Projects (OpenProject)
9. Wiki (XWiki)
10. Notes (Notes)
11. Tasks (Tasks)
12. IAM (Keycloak)

Nextcloud:

• Focus on file management
• Additional apps as extensions

Yes:

• Web interface (responsive)
• Nextcloud app (iOS, Android)
• Element app (iOS, Android)
• Email via IMAP (any client)
• Calendar via CalDAV

Community Edition:

• GitLab (openCode platform)
• Community forum
• Documentation

Contact us for:

• Personal demo
• Test access
• Technical conversation