Apple's iPhone 3G has been popular with consumers, but it still lacks a few key features that are keeping it from overtaking Research In Motion in the enterprise market. One issue for mobile workers is not being able to edit Microsoft Office applications on the go.

With this in mind, Quickoffice has released an application that enables iPhone users to edit Excel documents on the handset. Customers can also use MobileFiles Pro to view images, media, Office documents, iWork documents, and PDFs.

"This launch reinforces our commitment to deliver our award-winning software across leading smartphone platforms to allow more users to stay connected to all of their content and to improve productivity when on the go," said Paul Moreton, VP of product management at Quickoffice, in a statement. "We look forward to providing more upgrades to our iPhone application in 2009."

The application also enables users to transfer files to and from a desktop Macintosh or PC via Wi-Fi. Apple's MobileMe also is supported, as users can get remote access to iDisk files, as well as synchronize changes and new uploads. The company said MobileFiles Pro provides local pass code protection to keep the account and data secure.

"Quickoffice is taking an important first step in providing business users with useful applications that allow them to easily create and edit Excel files, much like they do on their desktop," said Michael Gartenberg, VP of mobile strategy at Jupitermedia, in a statement. "The iPhone is changing the mobile industry and with help of such high-quality third-party applications, it will continue to branch out from the consumer space, appealing to a growing number of business professionals."

The MobileFiles Pro application is available now in the App Store in the "Productivity" section, priced at $9.99.