Ubuntu JeOS

[nuseryame]

Do I use this as my Ubuntu Server in a virtual environment, instead of Ubuntu Server and putting it inside VirtualBox?

I just want to play around and install:
-DNS Server
-Mail Server
-Web Server
-Maybe Samba and mySQL
-SSH

What is a virtual appliance?

[Thirtysixway]

You can use the regular sever edition if you want. JeOS is more tuned for a virtual enviornment. A virtual appliance would just be a system running in something like virtualbox or vmware.