Leaving Microsoft 365 for Proton: A Practical Sovereign Stack Test
SME takeaway
Digital sovereignty is not ideology. It is dependency management.
Before you move away from Microsoft, Google, or any major platform, map what you gain, what breaks, and which business processes depend on the old stack.
I am not leaving Microsoft because I hate Microsoft. Microsoft 365 is polished, convenient, and powerful. For many SMEs, it is still the rational default.
But convenience is not the only factor. European businesses also need to think about jurisdiction, vendor concentration, privacy expectations, and how much operational power sits in one ecosystem.
What this migration is really testing
identity and communication
Email, calendar, contacts, aliases, and client scheduling are the first business-critical layer.
VPN
access and privacy
A bundled VPN can reduce vendors, invoices, and fragmented account management.
Docs
daily productivity
Proton Docs, Sheets, Drive, Pass, and Lumo must be tested against real client work.
The business question is not “is Proton better than Microsoft?” The better question is: which stack matches your risk model, client expectations, and workflow reality?
Proton’s direction is attractive: privacy-first services, Swiss jurisdiction, encrypted Drive, Docs and Sheets, VPN, password management, and Lumo AI with privacy claims that differ from big-tech assistants. But migration still creates friction.
That friction matters. A missing calendar workflow can cost meetings. A document compatibility issue can slow delivery. A password-manager migration can create support work. Sovereignty is valuable only if the business can still operate without heroic workarounds.
What SMEs should do before migrating
Practical migration checklist
This is not a call for radical decoupling. It is a call to understand dependency before dependency becomes strategy by accident. Start small, measure friction, and migrate the next layer only after the first one works for clients, documents, meetings, and recovery.
Treat your productivity stack as a business risk, not just a monthly subscription.
Sources
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I work with organisations across Europe on NIS2 compliance, penetration testing, and security strategy. Practical advice, no overselling.
