So Microsoft appears to have released KB4011029 specifically for Outlook 2013 users in an attempt to fix an issue resulting from the latest round of Office updates.
According to Microsoft:
This update fixes the following issue:
Mail delivery rules stop working. When you try to open the Manage Rules & Alerts dialog box in Outlook 2013, you receive the following error message:
The operation failed because of a registry or installation problem. Restart Outlook and try again. If the problem persists, reinstall.
What’s even more interesting is that multiple reports show that this also affects users of Outlook 2010 and 2016 and as Woody from askwoody.com states, why is it that Microsoft only have a fix for Outlook 2013 but not the others…crazy stuff indeed!