Proton’s hallmark is end-to-end encryption, and the Windows app upholds this standard rigorously. All emails are encrypted on your device before they ever reach Proton’s servers.
For threat models where the adversary controls browser extensions or where the user desires offline access without leaving a browser tab open, the Windows app is a clear upgrade. For users with extreme paranoia (air-gapped machines, Qubes OS), the web client in a disposable VM remains superior.
When locked, private keys are wiped from memory (decrypted state removed), but the encrypted SQLite cache remains. Requires re-entering mailbox password (or Windows Hello if enabled).
Proton’s hallmark is end-to-end encryption, and the Windows app upholds this standard rigorously. All emails are encrypted on your device before they ever reach Proton’s servers.
For threat models where the adversary controls browser extensions or where the user desires offline access without leaving a browser tab open, the Windows app is a clear upgrade. For users with extreme paranoia (air-gapped machines, Qubes OS), the web client in a disposable VM remains superior. protonmail windows app
When locked, private keys are wiped from memory (decrypted state removed), but the encrypted SQLite cache remains. Requires re-entering mailbox password (or Windows Hello if enabled). Proton’s hallmark is end-to-end encryption