Let's see here, one of the biggest developers in the world is going to actively NOT support the upcoming OS from the current leaders in this market? Very likely. I see exactly what you mean.

@Chet Husk

That would be correct. Surprisingly, Beta is still Beta, even if Microsoft nearly explodes with demand to try a Windows system that isn't Vista. Blizzard isn't going to waste time rebuilding their engine for a piece of software that could totally change before release.

Chet - what he meant is that Windows 7 is still in Beta, so it's not supported. It's not an "official" OS yet. Once Windows 7 goes live, of course Blizzard will support it. But we're still a bit away from that, so any users that have problems caused by Windows 7 are on their own for support.

@Chet Husk

While the operating system is in BETA? You're right, they're probably not, hence why I said it wouldn't be supported YET. That's how software development works. Having worked for what you might consider a large software company (IBM) for close to half a decade, unsupported means just that; unsupported. Beta platforms aren't supported by vendors because adequate testing can't be done to reasonably accommodate them, their quirks, and their nuances. This is because there's no guarantee that the OS won't change before it goes from being a release candidate to general availability.

For Blizzard to assign developers to fix game issues that occur on a beta operating system would be a waste of resources and man-hours.

This is the business of software development. This is how things work. I'm not saying that they'll NEVER support it (nor did I ever make that claim), but the likelihood of supporting a beta platform is slim.

@Molloch:

It's not necessarily a waste of resources to fix problems with Windows 7. The point of Windows 7 beta is not just to let ordinary people to have a peek of it, but also to let developers to check whether their applications have any compatibility issues with Windows 7. Therefore, it would be beneficial for Blizzard to iron out any possible incompatibilities with Windows 7 beta, so they can be pretty sure that when Windows 7 is finally released, WoW will be compatible with it.

However, with my own experience with Windows 7, I'd say that driver compatibility may be a greater issue. If you want to use Windows 7 beta to run WoW, make sure you have relatively new or very popular hardwares, otherwise you may not be able to find a good driver for it (although in most cases Vista driver works fine).

Only problem I've encountered so far using Windows 7 beta is when the game does its "anonnymous upload" thingy. Then I need to move the Survey.mpq and sometimes another file aswell from \Blizzard Entertainment\World of Warcraft\Cache to the Cache folder in my wow game folder.