...
- you need to select at least "unix" to use the farm.
- for email preferences select "none" if you are going to be short-term with the group
(this will forward your email to the existing address you entered on the form).
for most longer term people , you choose unix mail if you are a unix "guru", but most
people choose "exchange""exchange" for their email, but some unix gurus
prefer "unix" email.