Hi Fabio,
thanks for your message. Unfortunately, there is currently no way to reduce the disk space usage.
How many users and how big a message store are we talking about here? As I said, this will only affect messages newly imported, not the ones subsequently received.
If you can use Outlook in any way, that would reduce disk space usage, i.e. download the messages to a Outlook PST from your old mail server using IMAP and then importing them to Scalix using the Scalix Connector. In that case, Outlook would only create the messages as Scalix-Format messages and disk space usage should be a lot more conservative.
Let me know if this could work for you.
Florian.
