Thank you Graham, I will do this as a second option.

The only problem is if I create additional files there will be over 10,000 PDFs in total.

I am trying to do a one-off run which sorts all of the PDFs I have from 2007-present.

Going forward the macro I have will automatically update the PDF instantly upon arrival, so I will always have the latest version going forward.

However, for the previous years I am confident the modified date is accurate as these PDFs come from an Adobe Illustrator file and are created on every amendment, so the PDFs modified date is pretty accurate. However, if the command was easier to amend I could go by the date the email was received as that would be guaranteed to be accurate.

So, if anyone could help by updating my command to allow for this scenario I would appreciate it.