Can previous versions of Microsoft Office co-exist with the Office 2010 Beta?
If you are offered an “Upgrade” upon installation, Office 2010 (with the exception of Outlook) can co-exist with previous versions of Office by selecting that option from within the “Customize” menu. Microsoft Office Click-to-Run installations will co-exist with other installations of Office by default. Microsoft Outlook and Microsoft SharePoint Workspace cannot co-exist with previous versions so you will need to select one version of the program to have installed on your computer.
