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As far as I know the improvements aren't going to be backported to older OSs.
Rumour has it Microsoft restarted development work on IE7 since next major OS release is not due until 2006. I would be suprised if IE7 has not got popup blocker, and I'd say they would have to release it on Win2k, but probably not anything less than that.
there are certainly no plans by Microsoft to do so at the moment.
You are not suggesting that they will drop existing and desireable feature from current codebase? Whatever browser will be in the next version of Windows it is highly unlikely to be totally rewritten from scratch, and I'd say its given that popup blocker will stay.
Why? Because one thing Microsoft fears is losing real estate on desktop because real estate given leverage that they don't want to give ground on to no one. IMHO its strategically right position to take.
Microsoft are using their poor security record as an incentive to upgrade - they want to move people off Win98 and 2000 and over to XP, and the extra security features of XP SP2 are being used as a lever.