Using the Windows Live SkyDrive, you can actually create and edit your Excel documents on the iPad. To start, sign up for a free SkyDrive account at Live.com. In Excel 2010 or newer, you can add files to your SkyDrive account directly from Excel. Go to the File tab, select Save and Send, and then Save to Web. Enter your e-mail and password credentials for the SkyDrive account. You'll be able to choose the Excel folder in your SkyDrive account. Launch the Safari browser on your iPad and navigate to SkyDrive.Live.com. Sign in. You can now browse your folders and see the files stored on the SkyDrive. Before you attempt to open the workbook, you need to switch from the mobile site to the "PC site." When the PC site loads, select the Excel folder and touch the file you want to open. The file will always open in a view-only mode even though the worksheet calculates and charts will update.