Microsoft wants you to stop being a slackass and run out to purchase Windows Vista. It doesn’t matter if you have a lot of unsupported applications, or if you hate the updated layout, or if you find it slow, or if gaming performance lacks, you need to go buy it now.
Well, this is what Microsoft is basically saying, and they are encouraging people to not wait until SP1 before taking the plunge. You should “proceed with confidence”. Personally, I have no problems with XP, and they are not giving a great reason for upgrading. It won’t be much longer before it’s forced though, if you enjoy support of the latest applications and games.
SP1 is no minor update. Although Microsoft won’t officially comment on its contents, we do know that Microsoft is at some point going to provide a complete replacement for the Windows kernel, moving from version 6.0 to 6.1 — the same kernel found in Windows Server 2008.
Source: APC Mag