📧

Compendium 365 Mail

Business-class email on infrastructure you can host yourself: inbox, compose, forms, and secure send.

$8/mo · $80/yr · per mailbox

What it does

Your own email + calendar — an Outlook alternative.

Full webmail (Outlook-style)

Your domain, your data

Secure send

Forms & signatures built in

Desktop + PWA

A real app window with its own taskbar icon — not a browser tab.

Open app.compendium365.com in Chrome or Edge. Install from the app itself — this page is the product page, not the app, so pinning it just pins your browser.
Click the install icon in the address bar (a screen with a down arrow), or use the browser menu → Cast, save and share → Install page as app.
The app opens in its own window. Right-click it in the taskbar → Pin to taskbar, or pin Compendium 365 Mail from the Start menu.