The most significant differences are that WinXP Pro allows up to 10
simultaneous inbound network connections while WinXP Home only allows
only 5, WinXP Pro is designed to join a Microsoft domain while WinXP
Home cannot, and only WinXP Pro supports file encryption and IIS.
(Oh, and WinXP Pro usually costs roughly $100 USD more than WinXP
Home.)
Windows XP Comparison Guide
http://www.microsoft.com/windowsxp/home/ho...y/choosing2.asp Which Edition Is Right for You
http://www.microsoft.com/windowsxp/whichxp.asp