A. XP Home Edition and XP Professional are available in full and upgrade versions. If you're upgrading from a qualifying OS, you can purchase the less-expensive upgrade version; otherwise, you need to purchase the full version. However, even if you purchase the full version, XP doesn't support all upgrade paths. Review the following table to determine whether XP supports your upgrade path:

Current Version	Win XP Home	Win XP Pro
Win 3.1/3.11	No	No
Windows 95	No	No
Windows 98/98SE	Yes	Yes
Windows ME	Yes	Yes
Windows NT 3.51	No	No
Windows NT 4.0	No	Yes
Windows 2000 Pro	No	Yes
Windows XP Home	N/A	Yes
Windows XP Pro	No	N/A