MS Office applications do not run on iOS. Two options. Apple's version of the office suite, Pages and Numbers. The PowerPoint equivalent is Keynote. And for word processing alone SmartOffice 2. PDF documents open without further app necessary. If you want to fiddle with PDFs, then you might try PDFPen. Evernote and Dropbox are very useful as well. You can also access Google docs via your web browser. I use Safari because I like Safari, and the bundled Mail.app is good enough for me. Calendaring and contacts are also bundled apps. I don't know about graphic apps for iOS so someone else will have his/her opinion. There's a tutorial on Safari--go to the Bookmarks in Safari and it's on there.
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