One of the first mobile office tool kits for the iPhone, Quickoffice Mobile Suite is a generous viewer and editor. You'll be able to see Word, PowerPoint, PDF, and Excel documents with it, but the application's real power--the part you pay for--is in editing and composing Word documents and Excel spreadsheets. This new version importantly supports the DOCX and XLSX documents that are produced by Microsoft Office 2007 for Windows, and Office 2008 for Mac. At the time of this review, its closest competitor, Documents To Go, lacked the ability to create or edit Excel documents at all.
Quickoffice has the usual word processing and spreadsheet tools, including Apple's cut, copy, and paste. The formatting tools are logically arranged, fast, and easy to use.
Like other productivity applications for iPhone, Quickoffice lets you import files via a USB plug or an ad-hoc Wi-Fi network. It works well, but only if your computer is hooked up to Wi-Fi. Ethernet users will need to go the mechanical route to transfer files. Quickoffice also has the ability to read e-mail attachments, but through a less-than-ideal workaround. For the segment of the mobile workforce that actively works with Microsoft Word and Excel documents, Quickoffice is a sturdy choice, if not the least expensive.