A Collaboration project is an online workspace for members who are working together. The features of a project are designed to facilitate teamwork and include such items as a calendar, task lists, documents, discussions, announcements, and search.
When you are subscribed to a project, the system sends you a notification e-mail when any of these Collaboration objects are created in the project:
To view a list of all projects that you are subscribed to, navigate to the Subscriptions page.
To subscribe to a project:
Perform one of the following:
From the Overview application view page of
the project, click 
Subscribe.
A confirmation dialog box appears.
From the Project Explorer, select a community
project in the Community Projects folder, then in the details pane, click
Subscribe. A confirmation dialog box appears.
Click OK.
You are returned to the Overview application view page or the Project
Explorer.
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