As we know Microsoft has released MS Office pack for MSDN and to TechNet Users and soon it will be available to you also.But if you wanna try it now then you can.
TechNet Team is allowing you to download a 60 days trail pack which will help you to decide whether you should purchase it or not.
But before installing this pack you need to remove previous Office pack from your computer.This evaluation software will expire in 60 days after which it will deactivate and must be uninstalled before installing a purchased copy.
You will need to register for trail version which can be done using belows link:-
Register And Download 60 Days Trail Version Of Ms Office 2010