Please right-click DayZ in your Steam Library and select "Properties". Now go to the "BETAs" tab. Select if you wish to opt into or out of the Experimental version.
Please submit your bugs, suggestions and feedback here:
While DayZ is still in its development we are being very selective and limited on the server providers we choose to work with.
Currently, we offer server rentals through Gameservers.com, Fragnet.com, Vilayer.com, GamingDeluxe, and soon Multiplay.com.
Later on, we fully intend on extending this and even at the right time players will be allowed to create their own servers.