2. INSTALLATION AND USE RIGHTS.
One Copy per Device. You may install one copy of the software on one device. That device is the “licensed device.”
Licensed Device. You may only use one copy of the software on the licensed device at a time.
For Office for Mac Home and Business 2011 2 Pack:
License Rights: For software marked “Office for Mac Home and Business 2011 2 Pack”, you may install one copy of the software on the licensed device and one additional copy on a portable device for use by the single primary user of the licensed device.
Not quite true, you can install on a desktop and a laptop if you upgrade to a 2 pack
http://www.officeformachelp.com/office/licensing/eula-for-office-for-mac-2011/#section_2
Did you read my post? All of it? As in the "Few Exceptions like Family Pack"?