The fax service isn't automatically installed in Windows XP. To install the fax component:
Note: If you don't have a modem already installed, take care of that now. Make sure the modem is connected to a phone line and the phone line is connected to a working jack. (You'd be surprised how often folks overlook these details.)
After the fax component is installed, the next step is configuring it. You configure the Fax service in the Fax Console, the center for faxing tasks. To configure the Fax Console:

On the Tools menu in Fax Console, click Configure Fax, which starts the Fax Configuration Wizard. Click Next to start configuring your fax information.
On the Sender Information page, include your name or your business name and your fax number. Everything else on the page is optional.
On the Select Device for Sending or Receiving Faxes page, your modem will be selected, unless you have more than one, in which case, select the right one. Specify send and receive options, and whether you'll manually answer incoming faxes or answer automatically when received.
On the Transmitting Subscriber Identification (TSID) and Called Subscriber Identification (CSID) pages, enter your business name and fax number. These fields really matter when you're running special fax routing software. Most software of this kind depends on TSIDs to determine where to direct an incoming fax.
On the Routing Options page, specify how incoming faxes will be handled. All faxes are stored automatically in the Fax Console, but you can also print a copy or store a copy in a local folder or on your network.
When you want to change or verify any of these settings, simply run the Fax Configuration Wizard again. To open the wizard, on the Tools menu of the Fax Console, click Configure Fax.
You can fax a document that's stored on your computer or you can scan a document and fax it by sending to your fax printer. In this section, I'll explain how to fax a document from your computer. If you can print a document, you can fax it.
The Windows XP Fax service uses the Windows Address Book (WAB) as its default address book for fax numbers. When you install Outlook 2000 or Outlook 2002, the fax service switches to the Outlook Address Book (OAB) as its source for fax addresses. So you don't need to maintain two address books—just one will do.
To fax a document stored on your computer:
On the File menu of the document, click Print.
In the Print or Print Setup dialog box, in the Printer name box, click Fax to open the Send Fax Wizard. (When faxing from an Office program, on the File menu, point to Send To, and then click Fax Recipient. An Office Fax Wizard asks for specific information and then hands the process over to the Send Fax Wizard.)

To supply the recipient's fax number, click Address Book, and select one or more recipients just as if you were sending them an e-mail message.
If you've already set up Dialing Rules, skip ahead. If you haven't, click Dialing Rules. If you need to dial an extra digit to get an outside line, or use a special carrier code, or dial an area code even for local numbers, add those settings here, and then click OK to return to the fax sending.
Very Important: Telephone numbers must be in the canonical form in which a U.S. number would appear as +1 (626) 555-1212. If you use even a slightly different form such as (626) 555-1212 or 1-626-555-1212, the dialing rules won't be applied and the fax transmission will fail.
Select a cover page. Choose from the list or specify no cover page at all. Personally, I forego cover sheets unless I'm sending to a big corporation where it might get lost or the document needs some clarification.
Specify when the fax should be sent as well as the fax's priority. Priority only matters if you're stacking up a number of faxes to be sent at a particular time. In that case, the order of sending will be determined by the priority you set.
Finally, you're presented with a screen recapping the details of the fax and offering a chance to preview it. If the fax is a multi-page one, you'll be able to preview only the first page.
If you're sending the fax right away, the Fax Monitor, shown below, will start when the dialing does.

The second way to send a fax is to scan a document and then send it to your fax printer. The software that came with your scanner can help you set up this kind of fax and send it directly to your fax printer. However, you can also fax from a scanner using the tools in Windows XP:

To send faxes from Outlook, you have to add the Fax Transport Service as an e-mail account. To add Fax Transport Services in Outlook 2002, follow these steps:
Sometimes the fax doesn't make it. When that happens, you'll want to try again. You can specify how many times to retry, how many minutes apart the attempts should be, and request notification of the success or failure of the transmission. These settings are amazingly well hidden, so just follow me:
After you've installed and configured the fax services, receiving faxes is as easy as falling off a log. Easier.
When you configured the Fax service, you specified how you wanted the faxes answered and where they should be deposited. By default, the Fax Monitor opens automatically when the modem detects an incoming fax. You can change when and why it opens on the Tracking tab of the Fax Properties dialog box (mentioned in the procedure for troubleshooting fax transmissions).
To view an incoming fax, go to the Fax Console, and click Inbox. Double-click an entry to see the fax in Windows Picture and Fax Viewer. Faxes are image files in the TIFF format, so they can't be edited as a text file can be. But you can view, rotate, and perform basic tasks with your fax document without opening an image-editing program. To print a fax, right-click it, and click Print. To send a fax as an e-mail attachment, right-click it, point to Send To, and then click Mail Recipient.