How do I?

To view the headers, right-click the message line in your Inbox and select Options. The headers will be at the bottom.

I don't think Outlook has newsgroup capability without adding third-party options. Bill Gates doesn't like newsgroups; too subversive.

Start Outlook.
From the Tools menu, select Customize.
Select the Commands tab.
From the Categories list, select Go.
From the Commands list, select News.
Drag News from the Commands list to the Go menu, and then select where you want it to appear in the menu.
In the Customize window, click the Close button.
From the Go menu, select News.
From the Folders list, select news.vt.edu.
Click the Yes button.
Repeat the following for each newsgroup to which you want to subscribe:
From the list of newsgroups, select the newsgroup.
Click the Subscribe button.
Click OK.
From the Folders list, select the correct news group.
Repeat the following for each newsgroup to which you subscribed:
In the synchronization window, select the newsgroup.
Click the Settings button, and select All Messages.
Click the Synchronize Account button.