By default, when you run the Microsoft Office 2010 Setup program on a computer with earlier versions of Office installed, the earlier versions of Office are removed, and you might not receive a message stating that the earlier version is being removed.
If you click Upgrade in the Microsoft Office <suite name> 2010 Setup dialog box, you might see the following description:
Install Microsoft Office based on your current Office configuration, and remove previous versions of Office from your computer.
Important: Although we do not recommend installing and using more than one version of Office on a single computer, you can do so if you aren’t quite ready to upgrade all of your Office programs. For example, you can install and use both Office 2007 and Office 2010 on the same computer.
What do you want to do?
Keep earlier versions of Office programs
To set up the Office 2010 suite and keep earlier versions of Office programs on the same computer, use one of the following methods.
Important: You can have only one version of Microsoft Outlook installed on your computer. If you decide to keep an earlier version of Outlook, Microsoft Outlook 2010 is not installed.
Method 1: Use the Keep all previous versions option
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Run the Office 2010 Setup program, and then click Custom.
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On the Upgrade tab, click Keep all previous versions.
Method 2: Use the Remove only the following applications option
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Run the Office 2010 Setup program, and then click Custom.
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On the Upgrade tab, click Remove only the following applications.
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Clear the check boxes next to the programs that you want to keep.
More information
After you click Custom in the Microsoft Office <edition> 2010 Setup program dialog box, the Custom Setup dialog box opens. After you click the Upgrade tab, you see the following options:
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Remove all previous versions
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Keep all previous versions
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Remove only the following applications
Also, each installed program from an earlier version of Office is listed in the Upgrade tab with a check box next to each program name. When you upgrade to the Office 2010 suite, the Office Setup program targets the following versions of Office programs for removal:
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All versions of Microsoft Office XP
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All versions of Microsoft Office 2003
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All versions of Microsoft Office 2007
Versions of Office products that are not listed must be removed by using the Add or Remove Programs feature in Control Panel.
Important: Although we do not recommend installing and using more than one version of Office on a single computer, you can do so if you aren’t quite ready to upgrade all of your Office programs. For example, you can install and use both Office 2007 and Office 2010 on the same computer.
