Microsoft released Windows Mobile 6.1 this week, improving the operating system's stability and adding various features to make the Windows smartphone experience more enjoyable. While there aren't a ton of huge visible changes with this iteration of the OS, Windows Mobile handheld users, especially those with non-touch screen devices, will want to upgrade. The increased stability, threaded text messaging, and copy-and-paste functions alone make it worthwhile. For the low-down on all the new features, read our full review. (Microsoft and service providers have said that free upgrades will follow for most Windows Mobile 6 devices. Keep an eye on your carrier's support Web site for details.)

If you're entering the smartphone market or looking to change platforms, Windows Mobile has some cool attributes to consider. Thanks to its huge developer community, WM is your best bet if you want to add third-party software to your device. It's also the only operating system available on all the major service providers and in a wide range of device types.

AT&T's Tilt and the Samsung Blackjack II are the first handhelds available with Windows Mobile 6.1. The Samsung Blackjack II is a capable all-around messaging phone that's become more attractive with the addition of threaded text messaging and easier e-mail setup through Windows Mobile 6.1. The Tilt is our top choice for a general mobile office powerhouse.

Sprint has committed to updating four of its devices: the Motorola Q9c, the HTC Touch, the HTC Mogul and the Samsung Ace. Of these models, we think the HTC Mogul and Motorola Q9c will get the biggest boost from the upgrade. The Mogul is much like the Tilt, a general office powerhouse. The Motorola Q9c is a great-sounding phone that also excels at messaging with its great keyboard.

Check out the additional Windows Mobile coverage on our partner site SmartDeviceCentral (www.smartdevicecentral.com). You'll find lots of great tips for making the most of your Windows Mobile device.

Included in this roundup:

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AT&T Tilt
This brawny, do-it-all device integrates seamlessly with Microsoft apps to create the perfect mobile office for Windows users, while plenty of multimedia features, along with a nifty tilting screen, keep you entertained on the road.

HTC Mogul
Sprint's most powerful Windows Mobile device recently got an upgrade to the carrier's fast EVDO Rev A network, letting it connect to the Internet with one-megabit downloads and 500-kilabit upload speeds.

HTC Touch
The HTC Touch looks like a Windows Mobile answer to the iPhone, but WM 6 just isn't made for finger-centric devices. 6.1 should make the Touch a bit less touchy.

Motorola Q9c
Sprint's upgraded Q gives its subscribers an inexpensive, clear-sounding, multitalented smartphone, but a few flaws hold it back from true greatness.

Samsung Ace
If the Samsung Ace were a little faster or more polished, it could be a killer option for globe-trotting Sprint users. But as is, there are better options for Sprint users both at home and abroad.

Samsung Blackjack II
A sleek update to the popular original, the BlackJack II adds TeleNav GPS, AT&T Video Share, and more—while still keeping the price affordable.

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