Seriously don't.
If you need a zero cost OS that'll work well with Scalix for the long term, use CentOS.
You'll regret anything else because the upgrades can suck badly.
Having said that, you'll find all the Binary Packages for the currently supported OSes here:
http://www.scalix.com/community/downloads/
OpenSuSE 10.0 is old, so it's not supported any longer. This is what I'm referring to with the upgrade issues. If you currently run Scalix, and want to upgrade, you need to uninstall Scalix (keeping the message store), Upgrade the OS, then install the newer version of Scalix over top.
There's a very real possibility that you'll break the version of Postgres that you run, so just remove SIS and Cache data, and rebuild it after the install is complete following the upgrade.
Scalix 10 is old, and no longer supported. Think of it as Windows 2000. It's a good product, but it's been replaced. Scalix 11 is a worthwhile upgrade. If you need sx10 for a Disaster Recovery, or something like that, you'll need to request it from Support.
Kev.