Our I.T. consultant removed the Subject header in Outlook on a coworker's computer. How do I bring it back?

Anywhere in the other headers (to, from, whatever) right click.

Then click field chooser.

Then scroll down to "subject", grab it, and drag it to the header area.

There you go, it should be back now!

http://office.microsoft.com/en-us/outlook/HA011595...

The answer can be found there, depending which version of Outlook.

Add the Subject column to your Inbox

On the View menu, point to Arrange by, point to Current View, and then click Customize Current View.

Click Fields.

In the Available fields list, click Subject.

Click Add.

Right click in the heading bar (date, size, who to, whichever field, it doesn't matter) and you can add fields to the header bar from the list of available ones. It's one level down from the menu... might be called 'field chooser' or some such, but it's obvious which menu entry it is.