I moved into Nine a while back - it's great, and in fact the only Android app I've ever paid money for! It works well with my self-hosted email accounts, and b

I moved into Nine a while back - it's great, and in fact the only Android app I've ever paid money for! It works well with my self-hosted email accounts, and before I went full time on my own business, it worked well with O365 and Exchange too - and it didn't force Exchange PIN-lock policies on me. It also seems to allow customisation of just about everything, from view density to font sizes. Highly recommended it.