Cheryl Runkel Posted September 8, 2023 Report Share Posted September 8, 2023 Hello, When trying to open PDF attachments in Outlook, I constantly receive this prompt: "You should only open attachments from a trustworthy source." I have already tried (in admin mode) selecting to not ask again, but it will keep returning. I have also tried disabling/removing the Nitro add-in and changing the load behavior in Regedit from 3 to 0 to stop it from reappearing as an Outlook add-in. I need a resolution to this prompt. Link to comment Share on other sites More sharing options...
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