The code is working in both, though the 2010 seems to work for a few and then stop, so the certificate option may be the way to go, however, the 2016 version on my PC of course doesn't run the script when it is not open, but once Outlook is opened, the script runs and all the new emails do as they are told. I created the certificate on her 2010 PC, but I couldn't see where to go view the certificate from the steps you gave to test :/ and then got lost.
The client is going to be getting a new PC, so this may be a moot point, as everything on her current PC will be getting updated/upgraded.
Thanks for the help. I'm sure I will have more VBA Outlook questions at a later date.