Can I change my MS Excel 2003 application to a higher version by just upgrading online?
Upgrading MS Excel Application Online
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Instructions
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  Upgrade to Office 2007
1. Insert your Microsoft Office 2007 installation disk, or double-click the "Setup.exe" file in the installation pack you downloaded from an online retailer.
2. Enter your 25-digit Product Key when prompted and click "Continue" when a green check mark appears.
3. Check the box to accept the license agreement and click "Continue."
4. Select "Upgrade" from the installation options.
5. Wait as the program installs. It may take 15 minutes or more to finish installing.
6. Restart the computer when prompted.
  Upgrade to Office 2010
7. Insert your Office 2010 installation disk and click "Customize."
8. Select "Remove all previous versions" to remove Office 2003 and click "Upgrade." This will uninstall Office 2003, but it will not delete any of your Office documents.
9. Click "Upgrade" again to begin installation, which may take 15 minutes or more to finish.
10. Click "Close" to exit the installer.
Upgrading MS Excel Application Online
If what you mean by upgrading Microsoft Office Excel 2003 online is by simply clicking an update button within the software to start the upgrade, I don’t think it’s possible and it doesn’t work that way. You can upgrade Microsoft Office Excel 2003 to a much higher version like the 2007 version by downloading the installer or by downloading an ISO disc image of the software. If you choose to download a disc image of the application, you need to burn it on a blank CD and after that you will use the CD to install the latest version.
If you wish to download the installer, you may purchase Microsoft Office Excel 2010 for $139.99 at Softonic® – Enjoy Software! | Microsoft Excel. If you don’t wish to buy it, you may still use it for around 60 days before it stops working. This version supports Windows XP, Windows Vista, Windows 7, and Windows 8 and is around 1.5 GB to download. After downloading, uninstall Microsoft Office Excel 2003 then restart your computer when asked. After booting, install the newly downloaded Microsoft Office Excel 2010 and see the difference between the two.
