You do not have to have use email in Google Apps to use groups for sharing! You can set-up groups for the purpose of easily sharing documents, sites, calendars, and videos.

You will still create a group as outlined in the previous steps, but the email permissions will be irrelevant (if you do not have email turned on). When you are sharing calendars, documents, sites, or video you can use that group 'email address' and everyone who is a member of that group will automatically be shared with.

Example:

You do not have email turned on for your school, but Ms. Smith still wants her 3rd period history class group so she can easily share her online documents and class site. You create the group as you normally would, within the Users & Groups settings for 'history3smith@yourschool.org.' You add each of Ms. Smith's students as members of the group. Ms. Smith can then share her online document and class site with the address 'history3smith@yourschool.org' and each of her students will be able to access her document and site. Ms. Smith did not need to add each email address individually to the document or the site, she could still use the group 'email' address.