?
Štai ką nurodo MS apie office 2010 retail licenzijas. Nežinau ar tas pats 
galioja senesnėms versijoms:

Home and Student 2010:
"For example, Office Home and Student 2010 can be used on up to three PCs in 
a single household, but may not be used for any commercial, nonprofit, or 
revenue-generating activities"

Home and Business/Pro 2010:
However, Office Home and Business 2010 and Office Professional 2010 are 
licensed for one user's PC and on the same user's portable device"

http://www.skytech.lt/office-home-and-student-2010-32bitx64-p-45883.html
http://www.techsupportforum.com/microsoft-support/microsoft-office-support/461772-ms-office-2010-versions-pricing-licensing-options.html