You are moving mail from Microsoft 365 to Proton, outside our packaged “all Infomaniak” path. InfoSwitch runs these programmes under the UEswitch line: technical analysis, controlled history copy, DNS and user support—with fees noticeably higher than standard Infomaniak migrations because each source/target pair needs bespoke scoping.
Bringing workloads closer to Europe
Moving from Microsoft 365 to Proton often supports EU placement or jurisdictional control goals. We document scope for compliance and DPO conversations.
Microsoft 365 / Exchange Online specifics
Exits often rely on per-mailbox or tenant IMAP. Plan for online archives, cloud attachments, throttling and any legal holds before committing to a timeline.
- Shared mailboxes — Recreated on Proton with equivalent permissions.
- Authentication — OAuth or app passwords depending on Entra ID policy.
Proton Mail target
Proton focuses on encryption and privacy: depending on the plan, official IMAP import tooling has limits (volume, Business features). We size a realistic path from Microsoft 365 and set expectations (Bridge app, Proton clients).
UEswitch method (Proton)
Audit & inventory
Mailboxes, volume, aliases, critical rules and maintenance windows.
Target provisioning
Proton account creation, send/receive tests, folder plan.
Sync & deltas
IMAP copy (or adapted tooling), iterative passes, pilot sampling.
DNS cutover
MX, SPF, DKIM, DMARC; TTL reduction; coexistence if required.
Clients & hypercare
Desktop/mobile reconfiguration, internal FAQ, short project hotline.
UEswitch pricing
Cross-provider work needs more engineering than our standard Infomaniak migrations. Public Infomaniak-oriented pricing does not apply as-is: bespoke quotes, typically materially higher, scaled to volume and criticality.
Third-party brands
Microsoft et Microsoft 365, Proton AG / Proton Mail are trademarks of their respective owners. InfoSwitch provides independent migration engineering services.
UEswitch quote
Share volume and constraints: we reply with an indicative timeline and budget range.