Nokia Lumia 800, the company's flagship Windows Phone device, has been officially launched at the Nokia World conference in London today.

However, I had a chance to spend a little bit of time with the Lumia 800 prior to the launch. Not enough time to write a review—I can't speak to the call quality or battery life — but I can say that it felt great in my hand, had a gorgeous screen and a truly winning form factor.

Superb Design

Nokia's New Devices

If any company matches Apple when it comes to industrial design for their mobile phones, it's Nokia. Nokia might not have the same panache or flair for crafting beautiful looking devices, but the company certainly thinks about every little detail.

I've been told that Nokia really goes the extra mile when it comes to crafting its handsets. The polycarbonate shells for phones aren't simply sprayed with paint on the exterior. The whole of the material is dyed so that if scratched, the phone maintains its color. Nokia even tests various lotions creams against the materials it uses to make sure that the exterior of its devices won't stain.

This precision and attention to detail was made clear in a recent video showing off how the N9 is made. The N9, Nokia's first and last MeeGo phone, was unveiled in June. Although doomed from the start because of Nokia's decision to partner with Microsoft and focus on creating Windows Phone devices, the device is beautiful.

Fortunately, all of that hard work and engineering hasn't gone to waste. The new Lumia 800 takes the N9 design, adds a dedicated camera button and replaces MeeGo with Mango (Windows Phone 7.5).

The Feel

The first thing that struck me about the Lumia 800 was how it felt in my hand. It was light, yet it didn't feel insubstantial. It seemed to weigh less than my iPhone, but unlike some other devices, it didn't feel of lesser quality.

Likewise, the shape of the device was very well thought out. The sides of the device are curved, but the top and bottom taper and become flat.

The screen, which I'll discuss in more detail below, is curved to the design but done so in such a way that it looks and feels as if it is all one single piece of material.

The Screen

The pixel density may not match what Apple is offering in the iPhone 4/4S, but the screen that Nokia is using for the Lumia 800 is a thing of beauty.

Using Nokia's own version of Super AMOLED Plus, the blacks were black, the colors vibrant and text a joy to read.

Beyond that, the feel of the screen itself was smooth and responsive. The curve of the glass fit so nicely with the fit of the phone that it just felt right in a way that the curved glass of the Nexus S just didn't feel right to me.

Camera

I didn't have a chance to use the camera other than to load up the software — but the Carl Zeiss optics have a good track record in past Nokia phones.

Nokia has always put lots of efforts into its camera optics and if the Lumia 800 is as good as the N9, users are in for a treat.

As a Windows Phone

When I got to handle the Lumia 800, I did so alongside a number of other Windows Phone devices. Some of these have been announced and some are still prototypes. With Windows Phone, Microsoft has given manufacturers a minimum set of requirements that must be matched.

Phone makers, at their own discretion, can tweak things like the size of the screen, the power of the camera and the speed of the processor. I think this is a smart approach because it ensures that each phone will maintain a minimum set of requirements, but still lets phone makers switch things up to differentiate themselves from the rest of the market.

Despite seeing a lot of nice looking phones from all ends of the market, the Lumia 800 was clearly the best looking, best-feeling and most-promising phone of the bunch.

To Microsoft's credit, on the software side, it seemed just as quick and responsive as any other phone running Mango. Microsoft is still in the early stages with Windows Phone. The full push to Mango took place earlier this month and users are giving it solid marks.

Having spent some time with Windows Phone on and off over the past year, I like the OS. I'll be blunt, I'm an iOS user and I don't see that changing any time in the near future. Having said that, I've long-maintained that Windows Phone would be my second choice for a mobile OS. That was before the release of Mango and before the Lumia 800. The time I've spent with Mango in the last few weeks has impressed me.

Microsoft is doing some interesting stuff with voice search that is similar to what Apple is doing with Siri. The Microsoft voice recognition isn't as good, as the types of functions and activities that can be controlled with search aren't as well defined. Still, it's clear Microsoft is thinking about approaching navigation, discovery and mobile search in new and unique ways.

Microsoft has done something really special on the software side that allows users to pin certain functions of an application — like just the voice reminder function of Evernote — to a home screen. In short, the software that Microsoft has been building is great. What the company has needed, however, is flagship hardware.

As nice as some of the other Windows Phones are — and they are nice — nothing before the Lumia 800 really stood out against the smartphone competition. That's changed.

Bringing Out the Big Guns

The Lumia 800 may be the best thing to happen to Windows Phone, not because it's a great looking phone — but because it has the type of design that might make more users consider Windows Phone as a platform.

That's what the original Droid did for Android. It gave Android a brand name and in the U.S., a flagship device that could go toe-to-toe with the iPhone. It didn't matter if a user ultimately ended up buying an HTC or Samsung Android device, the Motorola Droid was what conceptualized and sold the Android OS experience to millions of users.

Microsoft and Nokia are both betting that the Lumia 800 does the same thing. For Nokia, this is Waterloo and it's time to stand and deliver. At least in my limited time with the device, it's delivered. This is a phone that has the goods and the OS — Windows Phone 7.5 — is worthy of its beauty.

Now we wait to see how the public at large responds.