Proven Exchange to ProtonMail Migrations—Fixed Scope, Senior Engineers
Yes, migrating Microsoft Exchange Server to Proton Mail for Business is a well-understood project: we extract, decrypt, and map data in phases. You keep control of the timeline and cutover—no forced big-bang.
The lowest-cost way off Microsoft Exchange Server: our migration tooling automates the repetitive work —you pay senior engineers for judgment, not keystrokes.
How we support Microsoft Exchange Server → Proton Mail for Business after migration
- ✓Senior engineers handle encryption keys and database decryption
- ✓Fixed-scope project—3-6 months, 2-3 consultants typical
- ✓No lost historical communications during extraction
- ✓Vendor support stays active on your legacy Exchange contract
- ✓Third-party support covers most issues if renewal lapses
- ✓Save 40-70% on legacy vendor renewals while you plan
Server-side mailbox indexing
Mailboxes must remain searchable through the transition. We map indexing requirements to Proton's client-side capabilities—no loss of access, no risky shortcuts.
Shared mailboxes & fluid delegation
Intricate access policies don't box cleanly. Senior engineers replicate delegation rules precisely, so teams keep working without disruption.
No Server-side transport rules on encrypted payloads
You can't run legacy transport rules after moving to zero-knowledge encryption. We help you redesign workflows for client-side processing—without stalling the project.
Microsoft Exchange Server → Proton Mail for Business migration — your questions answered
What happens if my Microsoft Exchange Server support contract lapses mid-migration?+
As long as your vendor contract is active, you stay under vendor support. If it lapses, our independent third-party support covers most operational issues on the legacy platform—but it's not vendor support and doesn't include vendor patches. We help you plan to avoid granting access to sensitive Mail data.
Will we lose any historical emails or shared mailbox permissions?+
No. We manage transition keys and decrypt legacy databases safely during extraction to guarantee no lost historical communications. Shared mailbox delegation policies are mapped and replicated with care, even complex dynamic access rules.
Why can't we just run Server-side transport rules or indexing on Proton Mail for Business?+
Proton's end-to-end encryption means Server-side indexing and transport rules can't run on encrypted payloads—that's the point. We redesign these processes for client-side execution, so your team retains search and routing functionality without compromising security.
What does your fixed-scope migration actually include?+
It includes assessment, key management, decryption of legacy Exchange databases, Mail flow redesign for encryption, shared mailbox and delegation mapping, and cutover coordination. Typical projects run 3-6 months with 2-3 senior consultants. You also get 24/7 US-based support during the move and post-migration help for Proton Enterprise features, including Encrypted Identity Management.
Handle the keys, keep every message—move to Proton with confidence.
We're ready to assess your Microsoft Exchange Server environment and map a secure Exchange to Proton transition—with no lost data, no downtime surprises, and a clear budget. Post-migration, we'll set up Encrypted Identity Management and Proton Enterprise support assistance to keep your organization protected. Book your Proton Mail secure migration assessment today.