Our current physical mail server, running both GW and Messenger, is a bit long in the tooth. We've migrated away from GW into a unified Exchange-based system, but the GW server is still active for some archival mailboxes that were not migrated for whatever reason.

Anyhow, I've spun up a new SLES 11.3 VM with the intention of migrating our Messenger services over to it. Originally, my intention was to run the two servers concurrently during a testing phase, but if I am reading the docs correctly, it seems that's not possible. What are my other options? Do I install it to a different tree and move it later?

I was also looking for clarification on LDAP vs eDirectory authentication. Would I be losing anything by choosing LDAP?