"We recommend that customers who are still running Windows 98 or Windows Me upgrade to a newer, more secure Microsoft operating system, such as Windows XP, as soon as possible."
Another problem with that statement is that XP Home will also have a very short time before it too looses support. M$ have already extended the life cycle support on XP Home (and it very soon will have to have been updated SP2 or no more support for pre-SP2 versions of XP Home). One of the main things that is/will extend XP Home support is that Vista hasn't been released to retail. Once that happens then I believe there will be 18 months support for XP Home, the XP Pro version has a longer life cycle than XP Home.
So any purchase of XP Home could have a very short support cycle.