Zoho Mail migration plan for my own domain, and HowTo questions

Zoho Mail migration plan for my own domain, and HowTo questions

Hi,

I'm looking into migrating our family email service which is currently hosted on my own server at my own domain using SME Server 8 (see: SME 8, a CentOS based distro).

Is it correct that the free account can have up to 25 addresses? Can this free account use my own domain?

I read about your IMAP import feature for importing our old emails. I'm guessing I would have to change my domain to point to your servers. As soon as I do that, our family email service will be down. Is there some way to setup a new account in Zoho Mail and import via IMAP from my current email server before changing my domain to point to Zoho? I'd also like to make sure our old emails can be migrated without exceeding our Zoho mail space limit, and without having our email service down the whole time I'm doing this.

Feel free to point me at the appropriate docs to learn more.

Thanks in advance,
Dan