// 4 apps · deploy as one
Self-host Office
Files + docs (Word/Excel/PPT) + chat + mail. Full Microsoft/Google replacement.
What this stack is
Self-host Office is the complete Microsoft 365 / Google Workspace replacement in one VPS deploy: files (Nextcloud), real-time collaborative docs (OnlyOffice), team chat (Mattermost), and email (Mailcow). For organizations that want full productivity sovereignty without subscribing to Microsoft, Google, or Slack.
For the hosting provider, this is the flagship "replace Microsoft 365" product — high-ARPU, high-retention, deep customer value. Sells to organizations of 10-200 users wanting full productivity-suite sovereignty.
What it's for
- File sync + sharing — Nextcloud handles user folders, team folders, external sharing
- Document editing — OnlyOffice provides real-time collaborative editing of Word/Excel/PowerPoint compatible documents
- Team chat — Mattermost replaces Slack for internal communication, channels, threads, integrations
- Email — Mailcow runs your domain's mail server with webmail (SoGo) + IMAP/SMTP
- Calendar + contacts — Nextcloud CalDAV/CardDAV syncs with phones + desktop clients
- Single sign-on — all four apps support OAuth/LDAP/SAML for unified identity
Who it's for
- Mid-sized organizations (20-200 employees) seeking Microsoft/Google alternative
- EU public-sector bodies subject to sovereign cloud + EU data residency mandates
- Open-source-aligned companies (foundations, OSS projects, B-corps) preferring self-host on principle
- Professional services firms (law, accounting, consulting) with strict client-data confidentiality
- Educational institutions wanting student/staff productivity without per-seat licensing fees
Apps in this stack
| App | Role |
|---|---|
| Nextcloud | File sync, sharing, calendar, contacts, tasks, central hub |
| OnlyOffice | Real-time collaborative editing (Word/Excel/PowerPoint compatible) |
| Mattermost | Team chat — channels, threads, file sharing, integrations |
| Mailcow | Mail server — IMAP, SMTP, webmail (SoGo), DKIM, SPF, DMARC |
Sizing & deployment
- Recommended VPS: 16 GB RAM, 6 vCPU, 80 GB NVMe storage
- No GPU needed
- Mail-heavy — sizing scales with user count + average mailbox size; budget 5-10 GB per user
- DNS work required — Mailcow needs proper MX + SPF + DKIM + DMARC records (the suite install includes the DNS instructions)
- Deploy time: ~30-40 min one-click (Mailcow has many components), all SSL automatic via Let's Encrypt
- Backup profile: nightly mail spool + Nextcloud data + Mattermost DB + Onlyoffice config
Why hosters sell this
This is the highest-revenue, highest-retention stack in the productivity category. Microsoft 365 Business Standard is $12.50/user/mo = $250/mo for 20 users. Your offer at $89/mo flat-rate wins on cost and on sovereignty.
Common resale shape:
- Small team tier — 10-30 users, single VPS, full stack
- Mid-size tier — 30-100 users, larger VPS, dedicated mail handling
- Enterprise tier — 100-200 users, dedicated infra, dedicated DPO contact, named SLA
Stack retail pricing is set by the hoster. See the suggested retail hint on this page as starting anchor; refer to bluix.net/bluixapps.php for the Bluix module license layer.
Compliance profile
- All communication + files stay on the VPS — no Microsoft/Google/Slack telemetry
- Email DKIM/SPF/DMARC properly configured for deliverability + anti-spoofing
- EU GDPR clean — full data residency, audit log, right-to-be-forgotten
- DPA-ready for processor ↔ controller relationship
- Eligible for EU Public Sector procurement — open-source stack, audit-friendly, sovereign