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
- Azure AD
- 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)
- Outlook on Windows version 2206 build 15330.20196 or later required
- Outlook on Windows version 2304 build 16327.20248 or later recommended
- Outlook on Mac version 16.65 (22091101) or later required
- Outlook on Mac version 16.75 (23070901) or later recommended
- Outlook on iOS
- Outlook on Android
- Outlook on the Web
Mail clients (signature preview for server-side signatures)
- Outlook on Windows
- Outlook on macOS
- Outlook on the Web
Signature 365 portal browser support
- Google Chrome
- Microsoft Edge based on Chromium
- Mozilla Firefox
- Apple Safari on Mac