Less You can install Office from a disc or by downloading it. Because of potential backward compatibility issues the default installed version is bit. However, if the bit version is a better choice, follow the bit installation procedure in this article. For more information about the bit version, see Choose the bit or bit version of Office.
Office plans include premium versions of these applications plus other services that are enabled over the Internet, including online storage with OneDrive and Skype minutes for home use. Office plans are available as a monthly or annual subscription.
[Tutorial] How To Install Microsoft Office 2010 Professional Plus