You can enable it in the registry, but they highly advise to use CHAP version 2.
I think that with Vista Microsoft wanted to get rid of all bad legacy stuff. They're much stricter with drivers and everything. Heck, they're criticised because they follow standards more closely and enforce higher security. :unsure: I just consider it temporary growing pains, and I'm convinced that SP1 on a modern system will be very enjoyable.
But everyone's milage varies. Personally I'm tempted to try Linux every year or so, but I get frustrated with command line stuff and always end up returning to Windows...
I don't like the word 'enforce'. You can't just follow the standards, for the stanards are not beeing followed by most of the people out there. I won't comment the higher security, since as proven on the first day of Vista's release, nothing is perfect, nor it will ever be. Everything's just relative and monkey talk, although I'm certain the operating system will become stable and secure in the near future. We are testing a great deal of operating systems here at the university and working closely with many developers (including MS). Linux is of course no match for Windows (especially for the latest XP from October '07) but at my opinion nothing beats Solaris, except for some very minor driver glitches. Vista is also no match for FreeBSD in terms of network security and stability. The only problem free OS's have to deal with, are non-free specifications of hardware interfaces. Otherwise they would be as successful as Vista or even more (excluding ReactOS, that OS is just horrible...).
Ok, to be short. If I had a great computer (Lenovo, AlienWare or Asus) I would probably run Vista for some very specific tasks (compilation, testing, etc.) and just use PuppyLinux for everyday work, since I do like to know what happens in the system and what the system is currently doing or what it's currently transmitting (and where) and to have out-of-the-box access to 30 file-system types and etc. etc. etc. even if performance is not so great.
@NickDon't forget to try it this year too!!! There is nothing more exciting than watching a BASH-master operate on a UNIX-derivate