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This undated screenshot provided by Microsoft shows Microsoft’s Office software package iPhone application, which offers people the ability to read and edit their text documents, spreadsheets and slide presentations on a phone. The company isn’t making an iPad version, though, nor is it offering the app on Android devices. Microsoft Corp. is treading a fine line as it tries to make its $99-a-year subscription offering more compelling, without removing an advantage that tablet computers running Microsoft’s Windows system now have, the ability to run popular Office programs such as Word, Excel and PowerPoint. (AP Photo/Microsoft)