After releasing a free version of the Quickoffice iPad app for its Google Apps for Business customers in December, Google today announced free iPhone and Android versions of the app exclusively for its Apps for Business customers.

Google noted the updated apps also bring new features including support for multiple Google Drive accounts, improved chart rendering, ZIP folders from multiple files, and the ability to sort Drive files by “Shared with me, Starred, and Recent”:

In addition to bringing Quickoffice to new devices, it’s also now easier to find and use your Drive files from within the Quickoffice app. Sign in with your Google Apps for Business account and your Drive folders view will now include Shared With Me, Starred, Recent and any subfolders.

Google acquired the productivity app maker in June 2012 with plans to integrate it into its Google App suite of products, but paid versions of the apps are still available to all iOS users on the App Store…

The Quickoffice Pro apps are available to all iOS users through the App Store for $14.99 on iPhone and $19.99 on iPad.