Believe now
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I've never heard of anything that was compatible with SP2 but not SP3. As far as I'm concerned, this compatibility thing is just a lie lazy sysadmins use to avoid working.
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Well you have heard of something now. The wireless card in an Acer laptop I had, Inprocomm IPN2200, would not connect to WPA protected WiFi after upgrading to XP SP3, open or WEP and it would work fine, but not WPA. It needed a driver update to fix, plenty of info about it on web searches, and that driver update was not available from Acer, I had to find it through 3rd parties as Inprocomm no longer exists. I rebuilt the laptop recently and after updating the driver, then updating to SP3, on doing the Windows Update I was offered the old driver, so the fix was not even something MS or Acer knew about, I was just lucky there was one.
Now I appreciate that is just one laptop for one personal user, (well 2 as my father had the same model of laptop), so not much grief, well not now that I know the problem, the wailing and gnashing of teeth when I first updated was different, though it does show the risk of any problems is negligible. However if you are running say 100 machines for a big company, do you take that negligible risk that they will all work without problems and be happy to take 100 users, including the owner, banging down your door wanting it fixed yesterday and there is no known fix ?
I do agree that in the time frame they have that any needed fixes should be found and upstream suppliers harassed to get one as necessary.