Supported Platforms and System Requirements
Sigsync Email Signatures for Office 365 is built to work reliably across a wide range of devices, email clients, and Microsoft 365 environments. This page outlines all compatible platforms and the essential technical prerequisites needed for a smooth and secure deployment. Whether emails are sent from Outlook on Windows, macOS, the web, or mobile devices, Sigsync ensures consistent, professional signatures across your entire organization.
Operating entirely in the cloud, Sigsync enables administrators to configure mail flow, manage signature templates, deploy the Outlook Add-in, and define signature rules from a centralized, web-based dashboard. Built on Microsoft’s OAuth 2.0 authentication and modern security standards, it ensures that user credentials are never stored or exposed, making it suitable for organizations with strict compliance and security requirements.
To help administrators prepare their environment, this page highlights the required permissions, supported Outlook versions, browser compatibility, and key prerequisites for centralized, server-side, and client-side signature modes. Verifying these requirements in advance ensures that your Microsoft 365 tenant is fully aligned with Sigsync’s secure and compliant signature processing.
Browser and Platform Compatibility
| Web Browser | Google Chrome, Microsoft Edge, Mozilla Firefox, Safari, Opera |
| Platform Compatibility | Windows, macOS, Linux, Android, iOS |
Required Permissions
| Details | Permission |
|---|---|
| Dashboard Access | Microsoft account or the email address used during Sigsync signup. The account owner can also add other users as administrators to the Sigsync dashboard and assign them full-access or limited-access roles. |
| Tenant Registration and Configuration | Microsoft 365 tenant Global Administrator rights. Authentication uses Microsoft’s secure OAuth mechanism |
| Signature Management | Sigsync account owner or assigned admins can create, edit, and manage signature templates and rules. |
| Subscription Management | Sigsync account owner or assigned admins can create, edit, and manage signature templates and rules. |
Microsoft 365 Plans:
| Microsoft 365 F1 / F3 | Fully supported |
| Microsoft 365 Business (Basic, Standard, Premium) | Fully supported |
| Microsoft 365 Enterprise (E1, E3, E5) | Fully supported |
| Kiosk Plans | Fully supported |
Sigsync Signatures Add-in for Outlook
| Required Permissions | Details |
|---|---|
| Microsoft 365 Global Admin, Exchange Administrator | Required for centralized add-in deployment |
Outlook for Windows
| Category | Details |
|---|---|
| Supported Windows Versions | Windows 10 (Version 1903, Build 18362) or newer, or Windows Server 2019 (Version 1903) or newer. |
| Supported Outlook Versions |
|
| Architecture Support | Both 32-bit and 64-bit Outlook versions are supported. |
| Partial Support (Windows) | Applies to older Outlook versions:
|
Outlook for Mac
| Category | Details |
|---|---|
| Supported Version | Outlook for Mac Version 16.59 (Build 22031300) or later |
| Requirements | Microsoft 365 subscription required |
| Important Note | The New Outlook interface must be enabled.If the toggle is not visible, go to Outlook (menu bar) → New Outlook to activate it. |
Outlook on the Web (OWA)
| Category | Details |
|---|---|
| Outlook on the Web (OWA) | Works with all modern browsers:
|
Outlook on Mobile (iOS & Android)
| Android Support | iOS Support |
|---|---|
| Android Support | Outlook for Android version 4.2330.0 or later |
| iOS Support | Outlook for iOS version 4.2314.0 or later |
Click here to know more details on the Outlook for Android version
Click here to know more details on the Outlook for iOS version
Note:
The Sigsync Signatures Add-in for Outlook works with shared mailboxes; however, full functionality may be limited in Outlook for Mac. This limitation exists because Microsoft’s Office Add-in platform does not yet provide complete support for shared mailboxes in the Mac version of Outlook.
Sigsync requires Microsoft 365 Global Admin rights only for the centralized deployment of the Sigsync Signatures Add-in. No elevated permissions are needed for everyday usage, signature assignment, or template management.
Important Notes
- Alias Email Support:
Sigsync applies signatures to emails sent using alias addresses (when users send mail with an alternate “From” address). Read More
- Shared Mailboxes:
Signatures for shared mailboxes are fully supported in server-side mode, regardless of the user’s device or Outlook client.
- Send As / Send on Behalf:
Sigsync supports applying signatures to emails sent using Send As or Send on Behalf permissions. Read More
- DKIM-Signed Messages:
Sigsync preserves DKIM integrity and supports signatures on DKIM-signed Microsoft 365 emails.
- Sent Items Signature Support:
Sigsync can insert signatures into messages stored in the Sent Items folder for both server-side and client-side modes Read more.
- Multi-Factor Authentication (MFA):
Microsoft 365 MFA is fully supported. Sigsync uses OAuth 2.0 authentication and does not store user credentials Read More.
Next Navigate To:
Streamline Email Signature Management with a Free On-demand Demo from Sigsync
Sigsync email signature service provides effortless, centralized signature management for Office 365 and Exchange. Our team can assist you in quickly setting up company-wide signatures. Request a free on-demand demo to see how Sigsync can simplify your email signature management process.
