At work, I still occasionally use Publisher 2007 even though we have Publisher 2016 as part of Office 365.
We have over 1000 publications produced in Publisher 2003 and 2007 that do not open properly in Publisher 2016, i.e. formatting is a mess. Compatible office packages such as LibreOffice cannot even open them, let alone the newer Microsoft Publisher files.
In this case, I’ll create a virtual PC to run the older office package.