Signature 365 system requirements
Check supported Microsoft 365 plans, directories, servers, and Outlook clients for Signature 365.
Signature 365 is compatible with the following plans, directories, servers and clients:
Microsoft 365 plans
- Microsoft 365 Business Basic
- Microsoft 365 Business Standard
- Microsoft 365 Business Premium
- Microsoft 365 E3
- Microsoft 365 E5
- Microsoft 365 F3
- Microsoft 365 GCC
- Office 365 A1
- Office 365 A3
- Office 365 A5
- Office 365 E1
- Office 365 E3
- Office 365 E5
- Office 365 F3
Directories
- Entra ID
- Active Directory
Mail servers (server-side signatures)
- Exchange Online
- Exchange Server 2013 CU21 or later, 2016 CU11 or later, and 2019
Mail clients (client-side signatures)
See the following article for details on supported clients:
Supported Outlook versions for Signature 365 client signatures
The Signature 365 add-in requires a Microsoft-supported version of Outlook. See the following article for Microsoft-supported Office versions.
Microsoft 365 supported versions
Mail clients (signature preview for server-side signatures)
- Outlook on Windows
- Outlook on macOS
- Outlook on the Web
Signature 365 portal browser support
The following browsers are supported in the Signature 365 portal. Support extends to the latest browser version and the previous two releases.
- Google Chrome
- Microsoft Edge based on Chromium
- Mozilla Firefox
- Apple Safari on Mac