"Let's break this question into two parts:

a) What have customers been migrating to? I am really impressed with web://cp, and have also investigated Plesk, cPanel, and a few other commercial ones. Most of them require some specific version of Red Hat, which is slightly irritating. I have also considered stock Apache/qmail/vmailmgr/etc, but I'm looking for something that grants a bit more power and flexibility to my end users.

b) How was the migration? We have hundreds and hundreds of e-mail accounts, aliases, mailing lists, etc on our existing RAQ's, and would like the transition to be as seamless as possible. I am looking to finally get around the info@domain1,info@domain 2 issue. Users don't seem to grasp the concept of making an account without a generic name and aliasing info@ to it, so any experiences on this are more than welcome! Our staff is rather limited (I'm pretty much it tech-wise), so the smoother the better!

I am also open to arguments for keeping the RAQ line. I have read that they are open sourcing sausalito and cme, but it looks like there is no short-term stable release of this. I'm looking at a few weeks to a few months as a migration timeframe."