Transfer E-Mails Using IMAP Protocol

We're going to use Larch (github.com/rgrove/larch) for this.
This is also performed on a Debian GNU/Linux system, using APT.

I've used it to transfer thousands of e-mails from an old to new server. 
You need to set up new accounts first, and know their default passwords. 
On the old server you can just hack a common password for everyone.
When using IMAP, it does not matter what mail system you transfer from-to.

GETTING STARTED
===============

We need Ruby installed, Larch will also ask for libsqlite3-dev:
$ sudo apt-get install ruby1.9.1-full libsqlite3-dev

Now we can use the ruby packaging tool to install Larch:
$ sudo gem install larch

Transfer all mails with all folders, per individual account:
$ larch --from imaps://IP-OLD-SERVER --to imaps://IP-NEW-SERVER --all

	NOTE:
	You'll be asked for the account and password, rest is automatic.