==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.9
- Deployed with iRedMail Easy or the downloadable installer? Installer
- Linux/BSD distribution name and version: Ubuntu 16.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): NGINX
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

So, currently my mail install is running in an Ubuntu 16.04 VM, and I'd like to upgrade to 1.0. However, 1.0 drops support for Ubuntu 16.04. This leaves me with some questions as to what is going to be the easiest/safest migration path.

1) Do I upgrade iRedMail to 1.0 even though technically, 16.04 is unsupported, and then upgrade 16.04 to 18.04?

2) Do I upgrade 16.04 to 18.04, and then upgrade iRedMail from 0.9.9. to 1.0?

3) Do I create a new install of 18.04, install 1.0, and migrate mail, user accounts, etc over?

With scenario 3, the migration documentation is a little unclear. It appears that migrating the passwords over is unsupported? Or is that the section on password hashes? Also, will this also move all the relay/forwarding/etc options in iRedAdmin Pro?

I'm not a linux expert, but I'm decently savvy. If I did option 3, I'd move from a VMware VM, to an LXC container (unless someone else has a better idea?) simply because most of my linux infrastructure has moved that way.

Anyway, just looking for some input on this. The migration documentation doesn't seem as up to date or as thorough as the upgrade documentation, so that gives me a bit of pause.