Microsoft office for mac is a completely different version from the office for windows because it is a version which is totally based on the Microsoft Office productivity suite for mac os x. You’ll get the key as soon as the registration process is complete. You could visit this link to sign up for the trial. This key is valid for one month, and after that, you need to pay to continue using it. Those of you who want to get free Microsoft Office 2011 Mac product key, you could sign up for Office 365 free trial and get the key. Our intentions are not to harm Microsoft software company but to give the possibility to those who can not pay for any piece of software out there. This release was created for you, eager to use Microsoft Office 2011 MAC full and with without limitations. According to this document, the product key was mailed to you in a mail. The whole activation procedure is described in Office for Mac 2011 Activation and Product key Information (via ).
Office 2011 requires activation and is tied to your hardware so it might very well be that you need to reactivate Office 2011 after the HD change. According to this document, the product key was mailed to you in a mail with subject 'Microsoft Office for Mac – Order Confirmation'.