Hi @Glenn Maxwell ,
is there a way that this forwarding is by default disabled.
According to your description, do you mean you would like the "Allow Forwarding" button unchecked by default for the user?
If this is the case, I'm afraid this is NOT feasible from the Exchange server side as to the best of my knowledge, there's no command or option available to configure this. The parameters like "MeetingForwardNotificationEnabled" and "RemoveForwardMeetingNotification" shared by Andy are intended for controlling the forward meeting notification messages which are similar to the image below:
So if you are actually looking for method to disable "Allow Forwarding" as stated earlier, I'm afraid these commands cannot meet your requirenment.
As regards to the Outlook client side, based on my test and research, we can disable the "Allow Forwarding" button via group policy or registry using its Policy ID 33187:
- Download the Administrative Template files via this link and copy the files into your environment.
- Open Group Policy Editor, go to User Configuration > Administrative Templates > Microsoft Outlook 2016 > Disable Items in User Interface > Custom > Disable command bar buttons and menu items > Enable, click Show, type 33187, click Apply:
3. Restart Outlook and check the result:
If you prefer disabling the button via registry, you can use the key below:
Important:
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\DisabledCmdBarItemsList
"TCID1"="33187"
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