Microsoft’s next operating system—Windows Vista—is still not ready for prime-time. At least that’s the view of three prominent Microsoft watchers who have been testing pre-release versions of the system.

Paul Thurrott was once viewed at Microsoft’s main online cheerleader, although he might be losing that title:

I’ve been working with Microsoft OS betas for over 12 years now, and while it’s very clear that Vista hasn’t exactly followed a trajectory that’s at all similar to any of the other betas, it’s also true that each OS beta has its own vibe. We might call Windows Vista a “train wreck” for simplicity’s sake.

Robert McLaws writes:

I’ve been defending Microsoft’s ship schedule for Windows Vista for quite some time. Up to this point, I’ve been confident that Vista would be at the quality level it needs to be by RC1 to make the launch fantastic. Having tested several builds between Beta 2 and today, I hate to say that I no longer feel that way.

And former Microsoft employee Robert Scoble adds:

This sucker is just not ready. Too many things are too slow and/or don’t work. I’ve been on the betas of every Windows OS since Windows 3.1 and Vista is starting to feel good, but it doesn’t feel good enough to release to the factory in October. It feels like it needs a good six more months than that, which would mean a mid-year release next year.

In other news, expect some major announcements from Apple next week.