Thanks for your reply gmayor.

The form I'm using will be posted on a Company Intranet SharePoint for which access is strictly controlled and restricted. All documents are tightly screened before being allowed to be uploaded. The security considerations of opening a macro-enabled document apply regardless of whether the author is an expert or novice in VBA.
I asked a simple question of how to auto-enable a standard message box, not to be lectured on security, the aspects of which I am fully aware.

I have received a solution to the problem and once again thank you for taking the time to respond.