What should Microsoft do with XP?

It seems there are interesting things happening in the world of Microsoft Windows.

Microsoft is scheduled to stop selling Windows XP on June 30th (except for ultra-mobile PC exceptions).

Unfortunately, because of customers demanding XP instead of Vista, Dell will be continuing to sell the operating system even after June 30th. They're doing this through some sort of bizarre loophole that lets them ship systems with XP installed, a Vista disc in the box, and report it to Microsoft as a Vista sale!

This seems pretty bizarre to me. I'm wondering what a good marketing approach to the problem is.

On the one hand, perhaps Microsoft should just recognize that some customers want XP more than Vista and extend the official life of XP beyond June 30th.

On the other hand, there seems to be some effort at Microsoft to move customers along and show them that Vista isn't so bad (particularly for newer computers).

Thoughts?