If I buy Microsoft Product in one Country will it work in another

One of the User asked on Microsoft Forums that if I buy Microsoft Products such as Office Professional in US, is it going to work in UK as well?.

My reply was marked as an answer which simply was that Yes, absolutely Microsoft Product purchased in one country works in other parts of the worlds as well so there is no issue if you buy from US and let’s say you use it in Pakistan.

msoffice-buy

The link to original MSDN thread: http://social.technet.microsoft.com/Forums/en-US/officeappcompat/thread/000826a0-efad-471f-adf8-fda3f0044fe9/#f287763e-16f5-4603-ad36-7d00b0a307c3