Philip Berne takes a classy slider with business e-mail capabilities and AT&T 3G network support for a spin, in our in-depth Nokia E66 review.

Review summary of the Nokia E66: 

The Nokia E66 is a fine business phone, and a great, small alternative for users who want a slick design inside and out, paired with loads of great features. The phone has great options for business users, including Exchange server support and a robust Office suite, though not everything is as easy to use as it might be on a carrier-supported phone, and we found ourselves frequently searching for server settings, additional apps and instructions, all to get the phone working on this country's most popular carrier. Once all the settings were in place, we were continually surprised by how feature-rich and powerful this device can be. A little smoothing for U.S. buyers and a great unlocked price would make this a very compelling phone indeed.
Pros:
Solid, classy design. Great keys. Live, while-you-type searching for contacts. Great Web browser. 
Cons:
Many features cost extra, like navigation and Quickoffice. Networking seemed slow in our tests. Could have more multimedia features, like the Nseries. 

Full review of the Nokia E66: 
Design - Very good

 The Nokia E66 is a very classy business slider. It has a tight feel to its shell, and it slides open with a smooth click. It doesn't have the seamlessness of a Samsung slider like the Helio Mysto, or even the Motorola Z6, and it isn't a small phone, but we liked the usability that the extra width added, and even the extra weight only served to make it feel solid. Besides the fantastic, brightly colored screen, the phone also features a very nice, comfortable keypad that was easy for typing, though it was only a numeric 12-key affair.

The interface is a re-skinned Symbian S60 design, so be prepared to dig through folders and enigmatic icons. The phone features a couple new design tricks, including an accelerometer that redraws the screen in portrait or landscape mode, depending on how the device is held. We didn't find this feature to be very useful, as it seemed like more of a parity update to compete with the Apple iPhone and Windows Mobile devices. More helpful was the fresh assortment of dedicated keys around the four-way button. Instead of the standard Symbian nonsense (check out the Nokia E65's keys for example), Nokia has wisely stuck with easily-recognized icons, including a Home key for the main menu, e-mail, address book and calendar.

Calling - Very good

Calls on the Nokia E66 sounded good, though we had some trouble with background noise on the busy streets outside our New York office. Indoors, however, the phone sounded fairly clean, and callers had no trouble understanding us. The phone has some nice address book features. We used the Nokia PC suite to synchronize with our Outlook Contacts, though the phone can also handle Exchange servers for e-mail, contacts and calendar entries. We especially liked being able to type a name from the home screen, from which the phone started narrowing a list of possible matches live, as we typed. This is our favorite way to handle contacts.

For calling features, Nokia once again stumbles on voice recognition. Though the Nokia E66 has a dedicated voice dialing button on the side, the speaker-independent voice dialing never once recognized our requests, a problem we've had with other Nokia devices in the past. Otherwise, conference calling worked well, and we had no trouble creating a four-way call from the phone. Bluetooth paired quickly with our headsets. The phone also features a speakerphone that is nice and clear, but not as pleasingly loud as the one we saw recently on the Nokia N78.