Mail migration to SUSE

Use an IMAP client.

Connect to the Exchange environment and to the
new environment and drag all mail from the old
folders to the new folders (folder by folder).

I'm not aware of any migration tools....,

Kind regards,
Nico Baggus

I attempted to script a migration tool once, but after fighting
with the microsoft side decided to give it up. I have done
several successfull migrations away from exchange to various
alternatives including openexchange server using exactly the
same method listed above. Simply have the openexchange
implimentation installed and running with the exchange server
still running. Add the new openexchange account as an IMAP
account and move folders.

I've found it easier to do such migrations on the weekend, using
microsofts EXmerge.exe utility (search on microsoft.com/
download for exmerge). Exmerge lets you export your
information store to PST files, then I simply either set up the
users imap accounts in my outlook, or give my account full
access to the information store (shared folders in
openexchange) and open each pst to move the files up.

it's time consuming, but works great and after the fact you still
have all the PST files as a nice backup with good portability.
Burn em off to dvd or cd for later use (because no migration
goes perfectly, ever)

OpenExchange Server (SLOX) is not just an email server, but a Groupware Server. If you use MS Exchange just for email, the job would be much easier because the only thing you have to do is create your users in SLOX and migrate their IMAP accounts. If the number of users is small, you could do this manually drag&dropping their imap folders from one server to another. If your server has a large number of users, You can try using IMAP migration tools like:

http://exchange-away.sourceforge.net/

or just try searching "imap migration" at freshmeat.net for some other tools

If you use MS Exchange not just for email, you should then try a commercial migration tool such as those sold by Bynari.

Good Luck on your upgrade.