Your existing Microsoft fax application will not work after upgrading to Windows XP. Uninstall this fax application using Add/Remove Programs in Control Panel, and then restart the upgrade.
After installing Windows XP, add a fax printer connection to reconnect to the Fax Server, and use Windows XP Fax to send and receive faxes using this connection.
For a list of software supported by this version of Windows, see the list of compatible software on the Microsoft Web site.