Configuring preferences and options in Outlook.com
I am currently with Zoho, and while the domain works, it
a) doesn't have as much success filtering spam out as Outlook or Gmail;
b) constantly asks to reauth with IMAP on Outlook iOS, which is really really annoying (and the main reason why I wanted to switch to Outlook.com).
I really really hope this isn't Microsoft cutting the cord, because it'd mean that in 2020 there is no product at all in the mainstream space for people that want personal email using a custom domain.