Whether you are upgrading to a new computer or are simply changing your workflow pattern, situations arise when Microsoft Office needs to be uninstalled from one computer and reinstalled on another. In situations like this it is necessary to deactivate a product that has been activated before installing it on a new computer. Unfortunately Microsoft Office does not have a product deactivation function. It is still possible to install Office on a new machine and deactivate the old computer; however, it may require extra steps.
Click the "Start" button on your desktop and choose the "Control Panel" icon.
Select the "Add/Remove programs" icon to launch the Add/Remove Programs application.
Chose "Microsoft Office" from the list of programs to add or remove.
Follow the on-screen prompts provided by the uninstall wizard to remove Microsoft Office.
Install Microsoft Office on your new computer with either your installation DVDs or your digital install file.
Click "Activate Online" when prompted. If the activation is successful, your old installation will be automatically deactivated on the registration servers.
Click "Activate Over the Phone" if online activation fails.
Enter your location information when prompted. The activation wizard will give you the appropriate phone number to call.
Call the phone number provided and tell the operator your installation ID. This number will be displayed on the screen within the activation wizard.
Enter the confirmation number the operator provides to you into the activation wizard.