Can I use SBS / SharePoint to allow specific customers to login and track progress?

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http://serverfault.com – I'm new to SharePoint and am building a collaborative internal website for issue tracking (one of the many SharePoint sites on this SBS machine). The site is already accessible from the outside of our network. We have a few customers who want to be able to login to our issue tracking system, post bug or change reports, and track the progress of their specific reports, as well as browse internal collaboration related to them. I'm sure SharePoint/SBS can do this, but I'm not sure how to set up the security. I tried creating a new user in SBS for a customer, added a new role "Customer" with a de (HowTos)