Hacker News Reader

Microsoft has a family plan, it's 99/year, includes five or six accounts and a few TB of onedrive storage along with a vanity domain.

The vanity domain must be registered with GoDaddy, and doesn't provide attachment screening nor email encryption.

So... It's artificially gimped for no real reason.

It's not supported but apparently it's possible to use a personal domain for Microsoft email without using GoDaddy as your registrar.