Dear colleagues,

Microsoft Is disabling default ActiveX Controls in Microsoft 365 apps from April 2025 and Office 2024 (from October 2024) to improve security. The default configuration setting for ActiveX objects will change from Prompt me before enabling all controls with minimal restrictions to Disable all controls without notification. The new default setting is equivalent to the existing DisableAllActiveX group policy setting.

What you need to do to prepare:

When this change takes effect, if you need to use ActiveX controls in Office documents, you can change back to the previous default behavior using any one of the following methods:

• • In the Trust Center Settings dialog, under ActiveX Settings, select the Prompt me before enabling all controls with minimal restrictions option.

  • In the registry, set HKEY_CURRENT_USER\Software\Microsoft\Office\Common\Security\DisableAllActiveX to 0 (REG_DWORD).

  • Set the Disable All ActiveX group policy setting to 0.

Kind regards,

Enterprise Applications & Solutions Integration (EASI)  

Information Technology Services (ITS)  

University of Toronto