Outlook will sometimes disables add-ins if that an add-in is slowing down Outlook or has crashed Outlook. Sometimes Outlook is only suggesting that the addin could be disabled and the user clicks disable without reading the prompt.
When you or the business users need add-ins to always be enabled you can force it to stay enabled. The following instructions detail how to prevent Outlook from disabling the add-ins.
If you have an add-in that is already disabled you can use these instructions to re-enable a disabled Outlook add-in here.
System administrators can use group policy.
Microsoft have ADMX templates you can download here,
Install the ADMX on the domain controller
Configure the group policy settings. The policy name is “List of managed add-ins”. It is located under
Policies\Administrative Templates\Microsoft Outlook 2016\MiscellaneousFor this you need to provide the Outlook add-in’s ProgID.
If you are an end-user or just dont want to use group policy for any reason, you can use the registry.
Registry option to force an add-in to stay enabled.
You can force add-in’s to be enabled, create the following registry key.
Outlook 2016 and newer: “HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\Resiliency\AddinList”
Outlook 2013: “HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook\Resiliency\AddinList”
Value Name. ProgID of the add-in.
Microsoft have an article that explains all of this in greater depth here.
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