The main advantage of the 64-bit version is its ability to handle , particularly in Excel and Microsoft Project. If you regularly work with Excel spreadsheets containing millions of rows or complex calculations, the 64-bit version can access more memory and process data more efficiently than its 32-bit counterpart.
In legitimate software distribution, Microsoft Office requires a valid or a subscription license to activate. During activation, the software contacts Microsoft's servers to verify that the license is genuine. Microsoft Office 2013 64 Bit Preactivated Download