How many computers can Microsoft Office 2007 be installed on?
You get 3 licenses with the retail version of Office 2007 Home
Other retail copies allow you to install on up to two computers,
provided at least one is a laptop/netbook. Both computers must also
be used by the same person. It may be possible to install on two
desktops, or on a friends computer, but this would be a violation
of the End User License Agreement (EULA). Microsoft has the right
to deactivate one or both installs if you violate the EULA.