An Open Source Microsoft 365 Alternative
Nextcloud is the open-source suite that replaces Exchange, OneDrive, SharePoint, Teams and the Office apps: AGPL-licensed server, free clients, open formats and protocols, and the freedom to run it yourself or have it run for you. MassiveGRID's Nextcloud Hub is the managed version, on the Nextcloud Enterprise branch, from $5.90 per user per month in the region you choose; the self-hosted version is free software plus your own server.
What open source buys you here
"Open source" in this search usually means three things at once: software whose code you can read and audit, a licence that lets you self-host or move provider without permission, and data formats and protocols that are not one vendor's property. Nextcloud meets all three. The server is AGPL-licensed, the desktop and mobile clients are free, documents are stored as DOCX, XLSX, PPTX and ODF, and sync, calendar, contacts and mail use WebDAV, CalDAV, CardDAV and IMAP. A company on a managed Nextcloud plan can take the same data to a self-hosted server, or to another provider, with the tools it already uses every day.
Against Microsoft 365 specifically, that means no tenant, no per-feature SKU and no licence true-up. The Enterprise subscription that MassiveGRID runs the Hub platform on, and that dedicated instances carry, adds a certified build, a longer maintenance lifecycle and vendor support; it does not add proprietary code or remove features from the community edition. Our Enterprise vs Community guide explains the difference.
App by app
| Microsoft 365 | Open-source counterpart in Nextcloud | Protocol or format |
|---|---|---|
| Exchange Online, Outlook | Nextcloud Mail, Calendar, Contacts (mailboxes included on Hub plans) | IMAP, CalDAV, CardDAV |
| OneDrive | Nextcloud Files with desktop and mobile sync | WebDAV |
| SharePoint document libraries | Group folders with permissions, federated sharing | WebDAV, OCM federation |
| Word, Excel, PowerPoint | Nextcloud Office (Collabora Online or Euro-Office engines, both open source) | DOCX, XLSX, PPTX, ODF |
| Teams | Nextcloud Talk (chat, calls, screen sharing, channels) | WebRTC |
| Planner, To Do, OneNote, Loop | Deck, Tasks, Notes, Collectives, Tables | Open formats; CalDAV for tasks |
| Forms | Nextcloud Forms | Export to CSV, ODS |
| Intune, Defender, Entra ID P1 | No equivalent in a collaboration suite; SSO via SAML and LDAP on dedicated instances | SAML, LDAP |
Nextcloud Office runs on Collabora Online (MPL) or Euro-Office (the 2026 open-source fork of ONLYOFFICE); our Office engines guide covers both.
Managed or self-hosted
Managed: Nextcloud Hub
Nextcloud Enterprise Ultimate operated by MassiveGRID, with Office, Talk, mail, backups and support in the per-user price, in the U.S., E.U., U.K. or Asia. Order 1 to 50 users online; dedicated instances with your own domain beyond.
Self-hosted: Nextcloud All-in-One
Free software on a server you rent, with Office and Talk containers included. Count the hours honestly: patching, backups, upgrades every few months.
Both, over time
Many teams start managed, grow, and move to a dedicated instance or their own servers; the data moves with the clients and Nextcloud's export tooling.
Other open-source suites, honestly
openDesk is the German public sector's sovereign suite and bundles Nextcloud with other open-source components for ministries; see our guide. ONLYOFFICE Workspace is document-first with a Microsoft-like editor, and its community edition caps simultaneous connections. Zimbra's open-source edition replaces Exchange only. ownCloud is Nextcloud's ancestor and narrower; our three-way comparison sets them side by side. For a full business suite with mail, files, documents, chat and video in one open-source product, Nextcloud is the one with the most users and the broadest app catalogue, which is why it is the one we run.
Nextcloud Hub Pricing
Per-user plans on MassiveGRID's Nextcloud Enterprise platform: files, office, email, chat and video calls, calendar and contacts, in the U.S., E.U., U.K. or Asia. Pick the region and team size to see what your team would pay.
First month for $1 on monthly billing with coupon code NEXTCLOUD, applied by the Order buttons.
- Files, Photos, Calendar and Contacts
- Nextcloud Office: documents, spreadsheets and presentations
- Talk: chat, audio and video calls, screen sharing
- Standard Email
- 100 GB storage per user
- Desktop and mobile sync clients, public share links
- Nextcloud Enterprise platform with managed updates and daily backups
- Ticket support
- Files, Photos, Calendar and Contacts
- Nextcloud Office and Talk: documents, chat, audio and video calls
- Notes, Tables, Deck and Tasks
- Standard Email
- 1 TB storage per user, ten times Starter
- Desktop and mobile sync clients, public share links
- Nextcloud Enterprise platform with managed updates and daily backups
- Priority support: faster response and escalation
- Files, Photos, Office, Talk, Calendar and Contacts
- Notes, Tables, Deck and Tasks
- Enterprise Email with delegation and other enterprise mail features
- 1 TB storage per user
- Desktop and mobile sync clients, public share links
- Nextcloud Enterprise platform with managed updates and daily backups
- 24x7 support
- Upgrade path to a dedicated instance with your own domain and branding
USD per user per month before taxes; the billing-cycle discount applies to every plan. Order 1 to 50 users online. Need your own domain, a compliance boundary of your own or more than 50 users? See the dedicated instances below or contact us.
Frequently Asked Questions
Same suite, your region, from $5.90 per user
Order a Nextcloud Hub plan and the first month is $1 with coupon code NEXTCLOUD. Move one team, run a month of real work, then decide.