7 Best European Microsoft Office Alternatives in 2026

Leviia Next is a French collaborative workspace built on Nextcloud combining file sync and share, calendars, contacts, video meetings, chat, office documents and tasks in a single sovereign platform. Operated by Leviia, a French cloud provider headquartered in Le Havre, it targets businesses and public-sector organisations that need a Microsoft 365 or Google Workspace replacement hosted entirely in France.

The platform pairs the open-source Nextcloud Hub with Leviia's managed operations, S3-compatible object storage and datacentre infrastructure. Users get familiar web, desktop (Windows, macOS, Linux) and mobile clients, real-time co-editing through Collabora Online, integrated Nextcloud Talk for chat and calls, and client-side encryption options for sensitive folders.

Key benefits:

• File sync and share across Windows, macOS, Linux, iOS and Android clients
• Real-time co-editing of documents, spreadsheets and presentations via Collabora Online
• Nextcloud Talk for chat, audio and video conferencing with screen sharing
• Calendars, contacts and mail with CalDAV, CardDAV and standards-based sync
• End-to-end encrypted folders for sensitive data with client-managed keys
• Managed operations including updates, backups and 24/7 French-speaking support
• Open-source core (AGPLv3) with no vendor lock-in on file formats or data export

Leviia Next is headquartered in Le Havre, France, with data centres located in France under GDPR and French CNIL oversight. ISO 27001 certification, SecNumCloud alignment, a full DPA and contractual exclusion of any non-EU sub-processor are standard on every plan.

Ideal for French and European organisations — including public administrations, healthcare providers and regulated industries — that need a sovereign, Nextcloud-based alternative to Microsoft 365 or Google Workspace hosted entirely under French jurisdiction.

mosa.cloud is a Dutch collaborative workspace whose mail module delivers team email with shared inboxes alongside docs, drive, video meetings, chat and spreadsheets. Named after the Mosa (Meuse) river in Maastricht, it positions itself as a sovereign alternative to Google Workspace and Microsoft 365 rather than a standalone inbox, so the email experience is tightly woven into the rest of the suite.

The stack is built on top of La Suite Numérique, the open-source workspace developed jointly by the French, German and Dutch governments and already used by over 200,000 French public servants. Mail ships with AI-assisted organisation, shared team inboxes, federated Matrix-based chat via Element, Collabora-powered document editing and kDrive-style file storage, all under one pay-per-usage billing model.

Key advantages:

• Shared team inboxes route support and sales mail to a group rather than a person
• AI-assisted triage summarises threads and surfaces the messages that actually need you
• Integrated Docs, Drive, Meet and Chat remove the need for parallel Google or Microsoft accounts
• Pay-per-usage pricing replaces per-seat licensing and scales with real storage and compute
• Open formats keep documents, spreadsheets and mail portable if you ever migrate away

mosa.cloud is operated from the Netherlands and runs entirely on EU-hosted infrastructure, meaning data never leaves European jurisdiction. Security controls are built to NIS2 expectations, and the underlying La Suite Numérique codebase is already trusted at national-government scale for sovereign communications.

For teams that want to replace the full Gmail-plus-Docs-plus-Meet bundle with something European, open-source and transparently priced, mosa.cloud is one of the most coherent options available.