Vista - Microsoft Communitites folder and account accidentally deleted

I had the Microsoft Communitites folder and account in Windows Mail, but I
deleted them by accident so how can I get them back?

Windows Help says:

Do I need to sign in to Communities to be able to use it?
Yes, for full support from Communities, you need to sign in. Once you are
signed in, you can post messages, rate the usefulness of messages, and sign
up for e‑mail notifications about specific message threads. Follow these
steps to sign in to Communities from Windows Mail:

Click to open Windows Mail.

In the folder pane, click Microsoft Communities.

Click the Tools menu, and then click Microsoft Communities: Sign in.