I use Zimbra ZCS just for me today. I tweak it a lot to fit on a dedicated server with Ubuntu 2GO RAM, but it's still too bloat.
What I would like is an Open Source alternative with same services (at least email, contacts, calendar) that can scale better for one user and others few services like HTTP server, transmission. (Zimbra as is is for companies with > 200 people I guess).
Any recommendations ? I saw some not tested alternatives :
Ubuntu server
Sogo
Scalix
Citadel
Zarafa