Where did the Internet System Preference go? How do I set my default Mail client, Web Browser, etc? Believe it or not, Apple moved these into the preferences of the respective Apple applications. You can find the default mail viewer application preference in yep, Apple’s Mail.app preferences panel.
You can likewise find the Default Browser and Save Location for files in the preferences of Safari. Why did they do this? I hope it is just an oversight to leave out the Internet system preference panel. I DO like having the information in the default application’s preferences panel, but I don’t like that being the only place it is settable.