I am using Yosemite - but my Mail is v 8 - how can I upgrade Mail? I want to use an auto configure for my new email address - but it says it can't do it automatically because my email program isn't a v10+.  What is the problem - is there a Mail upgrade??
There is no higher version than 8 for Apple's Mail app. 

Maybe is your auto configure talking about Microsoft Outlook version which is higher than 10.