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Supported Clients - O365 Add-In

  • Microsoft 365 Business (Business Standard, Business Premium) version 1701 or later
  • Office 365 Enterprise (E1/E3/E5/F3) version 1701 or later
  • Microsoft 365 Enterprise (E3/E5/F3) version 1701 or later (and are signed in Microsoft 365 using their organizational ID)
  • Office Professional Plus 2016 (MSI) version 16.0.4494.1000 or later
  • Office Standard 2016 (MSI) version 16.0.4494.1000 or later
  • Office Professional Plus 2013 (MSI) version 15.0.4937.1000 or later
  • Office Standard 2013 (MSI) version 15.0.4937.1000 or later
  • Office 2016 for Mac version 16.0.9318.1000 or later
  • Outlook mobile for iOS version 2.75.0 or later
  • Outlook mobile for Android version 2.2.145 or later
  • Outlook Web

Our O365 add-in requires “Mailbox version 1.5” (or higher) - here’s a link to Microsoft’s current documentation on Outlook JavaScript API requirement sets.

Following is Microsoft’s chart (modified by us) to show the Outlook / O365 clients we currently support.

email signature add-in supported email clients

Additional Requirements

Users must also have Exchange Online and active Exchange Online mailboxes. Your subscription directory must either be in or federated to Microsoft Entra ID.

How to Check Your Outlook Version

To check the channel/version of your Outlook desktop in Windows, go to File > Office Account. The current channel is displayed in the About Outlook section.

To view the Outlook version in macOS, click the About Outlook icon. The version details are displayed at the top of the popup.