I like that it's free for personal use, but you can upgrade to business email accounts if needed without paying an additional fee or having extra users associated with your account! The interface is easy enough so non-techies will be able figure out how their emails are set up in no time at all - though they may need some help getting used too setting filters (to get rid of spam).
Honestly when we first started using this product back around 5 years ago there were issues connecting our server…