System Requirements

What you need to run SpoofShield, and which platforms and email clients are supported.

Minimum System Requirements

Operating SystemWindows 10 / 11 or macOS 12 Monterey and later

Processor / RAMAny hardware that supports Microsoft 365 desktop apps (2 GB RAM minimum)

NetworkInternet connection required — the add-in contacts app.spoofshield.net to verify licence and log alert metadata

Microsoft 365 licenceAny M365 Business or Enterprise plan that includes Outlook desktop

Admin rights required for deploymentM365 Global Admin or Exchange Admin role to deploy via Admin Center. End-users need no admin rights.

Browser for web dashboardChrome 100+, Edge 100+, Firefox 115+, Safari 16+

Outlook Add-in Compatibility

Outlook client / configuration

Outlook for Microsoft 365 (classic, Windows)Primary supported platform. Full detection + dashboard.

Outlook for Microsoft 365 (classic, Mac)Full support. Mailbox API 1.1+ required.

New Outlook for WindowsSupported. Office.js add-ins carry over to the new client.

Outlook on the Web (OWA / outlook.office.com)Supported — DesktopFormFactor covers web app.

Outlook 2021 (perpetual licence) + Exchange mailboxSupported provided the mailbox is Exchange or M365.

Outlook 2019 (perpetual licence)Works if connected to Exchange 2016+ or M365. Older Exchange versions may not support all API calls.

Outlook 2016 or earlier (perpetual)Not supported. Mailbox API version too low.

Outlook connected to a Gmail / IMAP accountOffice.js add-ins require an Exchange or M365 mailbox. IMAP accounts are not supported by the Microsoft platform.

Outlook connected to a personal @outlook.com / @hotmail.com accountConsumer Microsoft accounts do not support custom add-in sideloading.

Outlook for iOS / AndroidMobile clients are not supported. The manifest declares DesktopFormFactor only.

Mailbox / Email Provider Compatibility

Email provider / server

Microsoft 365 (Exchange Online)Primary supported mailbox type.

Exchange Server 2019Supported.

Exchange Server 2016Supported.

Exchange Server 2013 or earlierMailbox API requirements not met.

Gmail (Google Workspace or personal)No Exchange/Office.js layer. Use the Chrome/Edge extension instead.

IMAP / POP3 accountsNot supported by the Outlook add-in. No browser extension equivalent for IMAP.

Chrome / Edge Extension Compatibility

Browser

Google Chrome (v100+)Fully supported.

Microsoft Edge (Chromium, v100+)Fully supported.

Brave (Chromium-based)Should work but not officially tested. Disable aggressive ad-blocking if the extension doesn’t activate.

FirefoxNot supported. The extension uses Chrome Extension Manifest V3 APIs.

SafariNot supported.

Internet Explorer / Legacy EdgeNot supported.

Supported Partially supported / conditions apply Not supported

No software installation on end-user machines

The Outlook add-in is deployed centrally via Microsoft 365 Admin Center. There is nothing for individual users to install or configure — the add-in appears in Outlook automatically for all licensed seats. End users need no admin rights.

Not sure if your setup is compatible?