In Outlook there is an interface that allows other programs to access certain resources in Outlook, such as inserting templates, automatic mail sending, access to the address book, etc.
There are three possible variants in the security settings:
- Access is automatically accepted without information.
- The user will be informed about an access:
- The Access is automatically blocked:
(The displayed message differs depending on the program)
These three variants can be controlled by Group Policy.
ATTENTION:
The security settings can’t be set selectively. As soon as they are active, they apply to every program access to Outlook.
GPO Settings
To be able to use the GPO settings, the Office ADMX must be installed first.
ADMX for Office 365 can be downloaded from the following link:
https://www.microsoft.com/en-us/download/details.aspx?id=49030
After installing the ADMX, you must first enable the “Outlook Security Mode” and set it to “Use Outlook Security Group Policy”.
The settings can then be defined under “Programmatic Security”.
Since this is a user GPO, the user must either run “gpupdate /force /target:user” or log on to the client again.