ReadWriteEnterprise

We written frequently about corporate microblogging tool Yammer and today they have made the digital equivalent of the Louisiana Purchase. This is a major land-grab for the company and an example of how wide they can extend their service into a variety of other nooks and crannies of our online lives. The announcement concerns six new partners and three new features.

Today, Box announced a tablet-optimized Android app, a PlayBook app (the company's first native app for any BlackBerry platform) and a new HTML5 mobile site. The Android version replaces the company's existing Android app and will work with both smartphones and tablets, optimizing the view depending on the device.

More interesting than the actual app announcements, Box CEO Aaron Levie revealed that the company has seen a 600% increase in enterprise sales regarding mobile. And yes, that's specifically enterprise sales, not overall sales. For example, Proctor and Gamble just became a Box customer based largely on the company's mobile support.

Earlier this week, thanks to the iPad, Apple overtook HP as the biggest vendor of mobile computers. Challenging HP, one of the largest vendors of both consumer and enterprise technology, is quite a feat. Expect this trend to continue. Recent surveys show increasing support for tablets in the enterprise, and more vendors are releasing iPad apps for business users. Here's a look at some of this week's data and new apps.