I understand that XP itself is going on 4 years old, and that mainstream support has already been retired for older versions. I also understand that it would take time and effort to port the newer technology to an older platform, especially when they would make nothing for it. The other day I was going through some old junk and found a copy of Windows 3.0 from 1990 I didn't even know I had, and I definately don't expect support for it.
However, Microsoft has recently stated that they are serious about protecting its users. They have released Antispyware for free (to legitimate XP users) and are offering security updates to everyone...including those who own pirated copies, just to help secure the internet. In addition, extended support for Windows ME and 2000 will be available through 2006 and 2010, respectfully. Given this, I'd think that they would also want to put forth the effort to secure users of previous versions of Windows.
In addition, almost half of all business users still run Windows 2000, according to a survey by AssetMetrix. Since mainstream support for Windows 2000 just ended last month (June 30th), and so many business still rely on the software, it really does seem like holding back IE7 is a ploy to get those users to upgrade.
Personally, It wouldn't affect me if/when support is completely cut off for all older versions, as the new versions of Microsoft software are automatically shipped to me at no charge. However, I'd like to see Microsoft show some real initiative and port IE7 to at least Windows 2000. It wouldn't be that difficult, as it has the same base as XP, and would be greatly appreciated by the thousands of security-conscious business still running it.
When it comes down to it, Microsoft's business practices (as well as many other large congolmerates) will be their downfall. The forgotten/ignored promises, delayed updates, insecure software, and frequent and costly upgrade fees have led users to try some of the alternatives, including Linux and Firefox. As Firefox community coordinator Asa Dotzler mentioned in this ZDNET article, their success is mostly due to Microsoft's way of thinking, and the Mozilla Foundation can't thank Microsoft enough for the latest announcement.
It's the cycle of life...the weak become strong, the strong become dominating, the dominating become blinded, and the blinded become susceptible to the weak.
John