Open-Source Google Workspace, Microsoft 365 Alternative

Why people look for a Google Workspace, Microsoft 365 alternative

Workspace and Microsoft 365 are the path of least resistance for a small company and the collaboration is genuinely excellent. They are also per-seat pricing forever, and they put every document, email and calendar inside an account structure you do not control — which becomes a compliance question the moment you have a client who asks.

Why this one

Nextcloud with its office and groupware apps is the most complete open replacement — files, docs, calendar, contacts and video calls on one system. The honest caveat is that real-time collaborative editing is still not as smooth as Google Docs, so this trade suits teams that mostly edit asynchronously.

Before you migrate

Self-hosting means you are the one who gets paged when something breaks at 11pm. Before committing, be honest about three things:

• Where will it run? A €4/month VPS handles most of these comfortably. A NAS or spare mini PC is even cheaper if you already own one.
• Who backs it up? A self-hosted service with no backup is worse than a cloud service, because at least the cloud service had someone else's redundancy. Set up automated backups before you migrate real data into it.
• How will you reach it remotely? Most people start with a WireGuard or Tailscale tunnel rather than exposing ports directly. That is the right instinct.

Migrating your data

Nearly every Google Workspace, Microsoft 365 competitor listed above ships an import path — CSV, JSON, or a documented export format. The practical move is to migrate one project or one folder first, run both systems side by side for a week, and only then cut over. Export formats are rarely as clean as the marketing suggests, and it is much easier to notice a broken import on a test set than on five years of records.