Above, the First Look Video of Windows Mobile 6 on the AT&T Treo 750. We'll bring you a full review of the updates and improvements built into Windows Mobile 6 on the Treo in the coming weeks, but for now we'll do a quick overview of the built-in features.

We know that some Treo users have been burned by ROM upgrades in the past, but we at TreoCentral are pretty confident that this one will be a keeper - it's been solid on Treo 750s on other networks. Download the update here. Below, the highlights of the most important improvements in this official update from the download page:

• Update for Loss of System Sounds - Included in the update.
• Improved Calendar functionality - See the big picture at a glance. New topline bar in the agenda view shows when you're free or busy, and when you have scheduling conflicts. Drill down to view meeting attendees, contact information, acceptance status, and reply-to or forward meeting requests.
• Additional email support - Send and receive HTML emails with tables, bullets, and colored text intact^2,3. The "smart filter" for contact search has been updated so you can search for emails stored on your company's Exchange Server³. Even send an out-of-office message from your device³.
• Windows Vista compatibility - Easily sync your smartphone to your Windows Vista PC, via the Windows Mobile Device Centre (WMDC).
• Better security and IT policies³ - Remotely wipe devices and SD cards clean in case of loss or theft. Plus, now IT can create and enforce tougher security policies, such as password protection to better manage the entire device fleet.
• Run existing applications - Most Windows Mobile 5.0 applications will work after you update to Windows Mobile 6. The .NET Compact Framework will be installed in ROM to make it easier for developers to deploy custom apps.
• Internet Connection Sharing - Utilize your smartphone capabilities by using your phone as a high-speed wireless modem for your laptop⁴. It's easy to set up and even easier to connect. Just click and go!
• Email hot keys - Work in the fast lane with single-key access to your most frequently used email functions. Press "R" to reply, "A" to reply all, or "M" to move to one of your folders.
• Email Inbox search - Find that important document or email. Automatically search for attachments, senders, or keywords by simply typing a few letters while you're in your email inbox.
• Access Sharepoint - Get what you need then get going. Access documents stored on your company's SharePoint servers via links in HTML emails. ^2,3

• AT&T Cellular Video (CV) - Take a quick break with streaming video⁵ on your smartphone-like clips from American Idol and other TV programs, broadcasts from CNN and NBC, sports highlights, weather forecasts, and more.
• AT&T Mall- Shop for MP3 ringtones and cool wallpaper graphics². Buy MMS postcards for birthdays and other events and pay as you go, with purchases showing up on your phone bill.
• AT&T Music² - Enjoy trial versions of XM Internet radio and Music ID, where you let your phone "listen" to the music and get a text message identifying it. Or download and watch your favorite artists in their latest videos. Link to popular fan sites. Buy tracks and manage your subscriptions from Yahoo! Music, Napster, or eMusic.²
• Voice Command via Bluetooth wireless technology - Get more done while you stay hands-free⁶. Dial by voice, or hear your upcoming appointments with your Bluetooth headset. Voice Command available in English, French, and German only.
• Active call access³- Manage your calls more efficiently than ever. Mute calls or use the speakerphone with a single tap on your active-call screen.
• USB cable charging- Travel tip: Now your smartphone will charge when it's connected to your laptop via the USB cable.