I am running outlook 2016, when I open the rules options, there is an "Upgrade Now" button, with the text.
We recommend that you upgrade your rules for better performance, unless you also use Outlook 2002 or earlier
As far as I know my rules are working fine as they are. I googled around and did not find anything about what this upgrade might do.
What is this upgrade and what does it do?
What will work less well, and what new features will it bring?