The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From xiaojie he:
Productivity Suite allows you to create, view and edit Microsoft Office 2007 and 2010 documents, PDF Files on your iPhone/iPad. You can transfer existing .doc or .docx or PDF from your PC to the iPhone/iPad via Wifi Transfer or USB Sync. Productivity Suite supports the following in editing Word and text documents + View, create and edit Microsoft Word 2007-2010 documents (.doc & .docx) + View Open Text Documents (.odt) + Convenient file transfer capability with support for Wi-fi transfers. + Spelling and grammar checking functionality + Insertion of headers, footers and comment + Support insertion, deletion, merging and spliting cells in tables + Word and characters Count + Text highlighting + Multiple and granular zooming + Unlimited number of undos and redos + Large number of font supports + International language input + Drawing tools support including drawing of shapes + Create, edit and share your documents effortlessly. No settings. No cluttered interface+ Document Folders: Drag&Drop to create. Use different color covers for different projects + Find and replace: Quickly search within a document, and it gives you the option to replace those terms with another + Instant text statistics and counters: characters, words, reading time, sentences, average word length + Convert Word to PDFs + Sign in PDF+ Quickly change Font, Font Size, Color+ Format characters as Bold, Italic, Underlined+ Align text to the Left, Center or Right+ Insert pictures+ Copy/Cut/Paste text+ Undo/Redo