Teambox is a relatively new player in the already overcrowded collaboration space, and it’s on a roll.

Just a few days after its seed funding round the company updated its platform with several new features that add a lot of polish to the cloud-based subscription service. One of the biggest enhancements is that Teambox is now integrated with Dropbox and Box, as well as a long list of other services including Google Apps, Outlook and even Evernote.

In addition, the solution’s built-in IM and note-taking capabilities are now by a joined group messaging feature that puts more ‘team’ in Teambox, extending existing functionality to support communications on a wider-scale. This is The Next Web’s impression of version 4.0:

“Teambox offers a slick, entirely cloud-based collaboration platform that enables organizations to integrate file-sharing services, group chat, interactive notes and Web-based apps in a single centralized place, in a bid to make it easier for teams to manage tasks, exchange files and communicate.”

Customers include Groupon, Southwest Airlines and Square. The company touts a 350 percent YoY growth in its customer base, easily qualifying it as a hyper-growth startup.

The fourth release of the solution was pushed out over the weekend, not long after the startup announced a $1.5 million seed funding round from a number of unnamed angel investors. Teambox didn’t disclose how much capital it raised since its founding in 2011, but it’s publicly known that early backers include David Beyer, CEO of Spinakkr, Julia and David Popowitz and a couple of angel groups.

Teambox has a lot of competition to out-hype, and it’s far from being the only player trying to bridge some gaps in the enterprise cloud. SpringCM is went for something very similar with the launch of Business Sync, only from the CMS angle.