A category tree of topics where a groups come sorted is borrowed largely from either Yahoo!'s have directory heirarchy, all the same a few subcategories around Yahoo! Directory Like music are so popular within Yahoo! Groups that it stand their have top-level category.

Too when providing e-e-mail relaying & archiving facilities for a several lists it hosts, the Yahoo! Groups service will bring extra functions, like ballot & calendar systems. This has helped persuade numerous big users to prove my point using the service, since these "value added" elements would exist as harder to provide in their have servers.