We've only seen Windows Mobile 6.5.3 officially on a handful of handsets. Now hows about on a 7-inch tablet? Enter the Mangrove 7 from C-motech, which we spied this week at CTIA in Las Vegas.

Windows Mobile 6.5.3 is Windows Mobile 6.5.3. And if you're used to Titanium (and clearly as you'll see in the video, I've been using Sense), then you'll be used to it here, for better or for worse. The OS looks like it's just slapped atop a larger screen, with no customizations. The photo gallery hardly uses the massive screen real estate, and the on-screen keyboard is -- and we're putting this kindly -- laughable, at best. (We're really not being mean ... Just watch the video.)

As for specs, the 7-inch screen is powered by a 1GHz Qualcomm Snapdragon processor ... which is severely hobbled by the fact that there's only 512MB of ROM and a very meager 256MB of RAM on board. The RAM's a killer.

Anyhoo, it's great to see Windows Mobile 6.5.3 on a tablet of this size, and it was a pleasant surprise at CTIA. It's just a shame that it appears to have been done on the cheap, and it's not like you're going to see this in stores anytime soon. Check out the video after the break.