How do we share documents in Word 2007?

Since you said you'd look at the Help files, you probably saw this already; however, I'm pretty sure this is the only way to do what you're needing to do. I used to use the "My Briefcase" method a hundred years ago, because it would "sync up" two versions of a document when you moved it from "My Briefcase" back onto your network drive or wherever it came from. But I don't know if that feature is even on PC's anymore. The method below will work ... but only if you fit the specifics in the directions below. Sorry.

Use one of these options when you want to share or collaborate on an entire document.

Let others review a document

To use this procedure, you must be using Microsoft Outlook®, Microsoft Outlook Express, Microsoft Exchange, or any 32-bit e-mail program compatible with the Messaging Application Programming Interface (MAPI).

Open or switch to the document that you want to send for review.

On the File menu, point to Send To, and then click Mail Recipient (for Review).

In the To and Cc boxes, enter recipient names separated by semicolons.

To select recipient names from a list, click the To or Cc buttons.

By default, the file's name appears in the Subject box. If you want, you can type your own subject.

If the document is stored in a shared location, the e-mail message will contain a link to the file to be reviewed. If you send the document to a reviewer who might not have access to the shared location, click Yes when prompted to include the file.

you'd need office 2007,cause it's not compatible with 2003.