Protonmail Windows App -

The Windows app can invoke Windows Credential UI (CredUI) to capture mailbox password, potentially bypassing user-mode keyloggers. This is a over web browsers where password managers and HTML input fields are easily logged.

Proton Mail, launched in 2014 by CERN scientists, is a Swiss-based encrypted email service that uses client-side encryption. Until 2022, access was primarily via web browser (JavaScript-based) or unofficial third-party desktop bridges. In late 2022–2023, Proton released an official (alongside macOS and Linux). This move aligns with a broader trend: secure services providing native-like experiences without browser extension dependencies. protonmail windows app

| Feature | Proton Mail Win App | Tutanota Desktop | Thunderbird + Enigmail | |---------|---------------------|------------------|-------------------------| | E2EE by default | Yes (PGP) | Yes (proprietary) | Manual (PGP) | | Local storage encrypted | Yes (AES-256) | Yes | No (unless encrypted volume) | | Windows Hello | Yes | No | No | | Offline full-text search | Limited | Full | Full | | Open source | No (backend open, app partially) | Yes (GPLv3) | Yes | | Third-party email access | No (only Proton) | No | Yes (any IMAP) | The Windows app can invoke Windows Credential UI