For those poor souls still using Public Folders, there are some benefits to upgrading to 2013/2016 Modern PFs. The over quota messages now contain the full path to the folder – not just the folder name – so that folder contacts can easily find the actual folder that is nearing its limit. Whew!
Your public folder “MyFolder” is almost full.
Your public folder “\Org\Dept\Group\Email\MyFolder” is almost full.